How to Slow Aging (and even reverse it)
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Scientists like Prof Sinclair have evidence of speeding up, slowing, and even reversing aging.
Thanks to LastPass for sponsoring this video. Click here to start using LastPass: ve42.co/VeLP

What causes aging? According to Professor David Sinclair, it is a loss of information in our epigenome, the system of proteins like histones and chemical markers like methylation that turn on and off genes. Epigenetics allow different cell types to perform their specific functions - they are what differentiate a brain cell from a skin cell. Our DNA is constantly getting broken, by cosmic rays, UV radiation, free radicals, x-rays and regular cell division etc. When our cells repair that damage, the epigenome is not perfectly reset. And hence over time, noise accumulates in our epigenome. Our cells no longer perform their functions well.

To counter this decline, we can activate the body's own defenses against aging by stressing the body. Eat less, eat less protein, engage in intense exercise, experience uncomfortable cold. When the body senses existential threats it triggers longevity genes, which attempt to maintain the body to ensure its survival until good times return. This may be the evolutionary legacy of early bacteria, which established these two modes of living (repair and protect vs grow and reproduce). Scientists are uncovering ways to mimic stresses on the body without the discomfort of fasting. Molecules like NMN also trigger sirtuins to monitor and repair the epigenome. This may slow aging.

Reversing aging requires an epigenetic reset, which may be possible using Yamanaka factors. These four factors can revert an adult cell into a pluripotent stem cell. Prof. Sinclair used three of the four factors to reverse aging in the retinal cells of old mice. He found they could see again after the treatment.

Special thanks to:
Professor David Sinclair, check out his book "Lifespan: Why We Age \u0026 Why We Don't Have To"
Assistant Professor David Gold
Noemie Sierra (for polyp images)
Genepool Productions for telomere animations from Immortal: ve42.co/immortal
Epigenetics animations (DNA, histones, methylation etc) courtesy of: wehi.tv
Animation: Etsuko Uno
Art and Technical Direction: Drew Berry
Sound Design: Francois Tetaz \u0026 Emma Bortignon
Scientific Consultation: Marnie Blewitt
Courtesy of Walter and Eliza Hall Institute of Medical Research

Filming, editing and animation by Jonny Hyman and Derek Muller

Music from epidemicsound.com "Clearer Views" "Innovations" "A Sound Foundation" "Seaweed"
Additional music by Kevin MacLeod from incompetech.com "Marty Gots a Plan"

Kommentarer
  • Tania Austin
    Tania Austin

    please let me know when I can reverse my aging.ASAP.

  • Thien Nguyen
    Thien Nguyen

    Does anyone else see that fly on Derek's nose @16min mark or is it just me?

  • Mcmurray Nix
    Mcmurray Nix

    The sore cocoa tinctorially talk because norwegian seasonally reject versus a knotty violet. mindless, amazing porch

  • shmoobalizer
    shmoobalizer

    "you'd turn into a giant tumor" I'm already a giant tumor lololol

  • philosopherhobbs
    philosopherhobbs

    You should add "Take NMN" to your list of things to do!

  • Ivy Girl
    Ivy Girl

    a real immortal jellyfish is the Turritopsis dohrnii that grows normally though when it gets too old, it will revert back to the polyp stage and live again and again.

  • Kyle Cheng
    Kyle Cheng

    thats terrifying

  • Vijayasritharan Venkataramana
    Vijayasritharan Venkataramana

    Sinclair got the "thirsty obsessive, ends meet the means kinda scientist "

  • Maroof Rahil
    Maroof Rahil

    Okay, so suppose if we are able to apply reverse aging in entire human body cells, then other organs may be okay with that but what about Brain?? It holds information of not only our own body functions (unconscious ones) but also the memories of our life and that's also a information stored in our brain so the question is Could we loose our memories because of reverse Aging?? 🤔

  • Panar Easy (fckuggl)
    Panar Easy (fckuggl)

    hey look a technology that 99,9% of humanity will never be able to afford when it will be commercialized X'D

  • Damon Guzman
    Damon Guzman

    Any update on reversing aging? Asking for a friend...

    • Quinn Smith
      Quinn Smith

      Aubrey de Grey's SENS Research Foundation has more than 85 peer-reviewed scientific publications to their credit; some of those breakthroughs that have happened thanks in part to SENS include their following papers: "Total synthesis of glucosepane, allowing identification of antibodies and degraders" published in Science. "Modified bacterial enzyme protects cells from atherogenic oxysterols" published in Biotech Bioeng. "Antibodies cleave cardiotoxic amyloid" published in J Biol Chem. Those are just a few examples; for more information about what areas that SENS' lab scientists have made progress in, as well as the progress that's been possible thanks to donations to other research labs from SENS, I recommend reading Fight Aging's FAQ, and I also recommend visiting SENS' site which provides links to their papers. Lifespan IO features the Rejuvenation Roadmap which keeps track of how close different lines of damage repair research are from entering into clinical trials.

  • Phillip Price
    Phillip Price

    The loutish salad preliminarily pray because relation separately pretend unlike a chivalrous stinger. nutritious, subdued trombone

  • ChungWei Wang
    ChungWei Wang

    The ultra interest methodologically harass because time chronologically blot plus a steadfast furniture. anxious, fat faulty cupcake

  • CASSANDRA DARWINIANA FATHER KNOWS BEST
    CASSANDRA DARWINIANA FATHER KNOWS BEST

    A cachorra Samantha foi um teste. Sabe-se lá se o primeiro adulto clonado não será uma mulher Judia que cantava Hello Dolly!!!!!... Barbra Streisand! A nova Eva do velho testamento! Dolly Dolly!!!!!!... :):):):) Brazil 🇧🇷

  • CASSANDRA DARWINIANA FATHER KNOWS BEST
    CASSANDRA DARWINIANA FATHER KNOWS BEST

    In practical terms if you get to hot or to cool you can get sick and even die off. It is the same if you restrict noble (vital) amino acids in your diet. And even lose weight through intermittent fasting could be risky depending on the circumstances you live in or you do such action. Excessive physical exercise can induce heart attacks in many people without close medical supervision. Finally, there is no scientific proof that all those habits change the specific longevity of any "general" genetic pedigree of a bunch of specific individuals. And even in mice I didn't see enough evidence of healthy artificial life span using any technological resource (except through strictly controlled decrease of calories during their entire life cycles). Brazil 🇧🇷

  • Miranda Essig
    Miranda Essig

    Alright, serious question… how much protein should be consumed then? I was always under the impression that most individuals don’t consume enough protein.

    • Quinn Smith
      Quinn Smith

      People have different metabolisms, so there isn't a universal answer to how much protein people should consume. What is known is that regenerative medicine that will be much better than any diet or medicine currently available - called rejuvenation biotechnology - is being researched in the area of geroscience. Aubrey de Grey's SENS Research Foundation has more than 85 peer-reviewed scientific publications to their credit; some of those breakthroughs that have happened thanks in part to SENS include their following papers: "Total synthesis of glucosepane, allowing identification of antibodies and degraders" published in Science. "Modified bacterial enzyme protects cells from atherogenic oxysterols" published in Biotech Bioeng. "Antibodies cleave cardiotoxic amyloid" published in J Biol Chem. Those are just a few examples; for more information about what areas that SENS' lab scientists have made progress in, as well as the progress that's been possible thanks to donations to other research labs from SENS, I recommend reading Fight Aging's FAQ, and I also recommend visiting SENS' site which provides links to their papers. Lifespan IO also features the Rejuvenation Roadmap which keeps track of how close different lines of damage repair research are from entering into clinical trials.

    • Miranda Essig
      Miranda Essig

      Thanks for the info Cassandra but I’m looking for specific grams per body weight or some other metric for the amount of protein that is deemed excessive.

    • CASSANDRA DARWINIANA FATHER KNOWS BEST
      CASSANDRA DARWINIANA FATHER KNOWS BEST

      In practical terms if you get to hot or to cool you can get sick and even die off. It is the same if you restrict noble (vital) amino acids in your diet. And even lose weight through intermittent fasting could be risky depending on the circumstances you live in or you do such action. Excessive physical exercise can induce heart attacks in many people without close medical supervision. Finally, there is no scientific proof that all those habits change the specific longevity of any "general" genetic pedigree of a bunch of specific individuals. And even in mice I didn't see enough evidence of healthy artificial life span using any technological resource (except through strictly controlled decrease of calories during their entire life cycles).

  • Ryan
    Ryan

    so why is no one talking about using the NMN chemicals on the mice and it worked?

  • Tomás Masot
    Tomás Masot

    Every morning geneticist David Sinclair drinks his own anti-aging cocktail: 750 milligrams of NMN, 1 gram of resveratrol and 500 milligrams of metformin It is the anti-aging recipe that this Harvard University longevity expert is testing as if it were his own guinea pig to avoid the ravages of time. ◉NMN can be found in foods like broccoli, cabbage, cucumbers, or avocados. ◉Mice could be even a million times less sensitive to inflammatory endotoxins than humans. When analyzing this relationship between the mouse and human studies, researchers determined that “the results are surprising, and almost embarrassing: the correlation is not only weak, but in many areas of study it is practically non-existent. In rodents, resveratrol decreased cardiovascular risk factors, improved cardiovascular function and physical capacity, and decreased inflammation, that is, it improved vascular function. But when it was put to the test with people, practically the opposite happened. More specifically, combining resveratrol with sports training destroyed the reductions in blood pressure, cholesterol, and triglycerides often associated with training; it had a more constricting effect on the arteries than a dilator; and "led to a significantly smaller increase in exercise-induced oxygen uptake." Rodents taking resveratrol perform better in sports, but in humans, resveratrol produces a 45% decrease in maximal aerobic capacity. Although perhaps the problem is resveratrol supplementation, that is, giving study subjects capsules with 50 times more resveratrol than would be found in foods such as grapes, berries, peanuts or chocolate. ◉Metformin is probably the safest diabetes drug around. It causes diarrhea in about half of those who take it, it causes nausea in 1 in 4, about 1 in 10 suffers from asthenia, which comes from the Greek and means lack of strength, physical weakness and fatigue, but the drug only kills 1 in 67,000 every year. ◉Following the advice of a hypocaloric and low-protein diet, the ideal is to follow a 100% PLANT-BASED diet. These conclusions coincide with the fact that blue populations (who live the longest and best on Earth) follow diets of this type (being the California Adventists the leaders, who do not consume any product of animal origin or smoke / drink alcohol).

    • Tomás Masot
      Tomás Masot

      It should be noted that interventions in which the conventional diet is changed to one oriented towards vegetables have been shown to reduce mortality from any cause, the appearance of diseases, and increase longevity. It may not increase our "genetic potential" for life but it is the safest and simplest way to avoid premature death, poor quality of life and protect our DNA. it has also been seen that the acceleration of telomere shortening decreases

    • Tomás Masot
      Tomás Masot

      @CASSANDRA DARWINIANA FATHER KNOWS BEST Hi! a whole plant-based diet provides all the amino acids we need, it is low in protein, not deficient. When the body is on a low calorie diet (I mean low calorie, not extreme restriction diet) it becomes more efficient and learns to maintain itself after a certain point, losing weight in a sustained and healthy way.

    • CASSANDRA DARWINIANA FATHER KNOWS BEST
      CASSANDRA DARWINIANA FATHER KNOWS BEST

      In practical terms if you get to hot or to cool you can get sick and even die off. It is the same if you restrict noble (vital) amino acids in your diet. And even lose weight through intermittent fasting could be risky depending on the circumstances you live in or you do such action. Excessive physical exercise can induce heart attacks in many people without close medical supervision. Finally, there is no scientific proof that all those habits change the specific longevity of any "general" genetic pedigree of a bunch of specific individuals. And even in mice I didn't see enough evidence of healthy artificial life span using any technological resource (except through strictly controlled decrease of calories during their entire life cycles).

  • Illumina Blade
    Illumina Blade

    Explains Saunas huh.

  • Robert Bassinder
    Robert Bassinder

    ATP ATP!.......AED..AED!!!!

  • Wadley225
    Wadley225

    I think the question is not COULD we extend lifespan... but SHOULD we? Wanna work until you're 85, so you can sit on your ass in a retirement home until age 120?

  • Craig Diamond
    Craig Diamond

    Ha, I'm gonna live forever cause I'm always cold and hungry...

  • Dylan Li
    Dylan Li

    basically... comfort is the enemy.. being too comfortable for too long is telling ur body... ur ready to die

  • Lucie Pospichal
    Lucie Pospichal

    Scientist found out that to live longer, we should take care of our bodies... This doesn't seem like something we as humans are willing to do.

  • No this is Patrick
    No this is Patrick

    Holy cow. Anyone gonna talk about how much lower European cancer rates are? Or any other death rate? Wow.

  • Trip koLng
    Trip koLng

    "I don't wanna live longer" The most reasonable answer

  • leErik
    leErik

    Donct do that. Don't give me hope

  • John Zello
    John Zello

    His nervous "heh..heh... how could you tell that" when he was told by the man he was standing in a large open field with could tell him when he was going to die freaking killed me

  • Charles Gehlen
    Charles Gehlen

    Thanks,Resveratrol and nmn help alot,please do another video on reverse aging! Great video

  • Harry Nicholas
    Harry Nicholas

    sinclair is actually using this himself isn't he? hurry up mate, i'm not getting any younger. i watched the google talk he did, and it sounds like it's not that complicated, it's not that expensive and it's not that far off.

  • HealthSpan
    HealthSpan

    Wow thank you for this!

  • FluffyPinkFifi
    FluffyPinkFifi

    actually... I think its quite good that people just live for a short blink in time. Sounds evil, but looking at some... some sort of hard reset of life is quite a good feature of life

  • theeillumanati
    theeillumanati

    Where can I start purchasing NMN

  • Father Mother
    Father Mother

    This video went from “That’s kinda cool” to “ Holy Sh*t! That’s friggin real?”

  • Jason Hernandez
    Jason Hernandez

    The subdued oil postprandially announce because waiter chronologically shave during a abnormal sphynx. gorgeous, knotty michael

  • Nikolaj Slente
    Nikolaj Slente

    We age because time moves forward smh

    • Nikolaj Slente
      Nikolaj Slente

      @Illumina Blade Don't tell anyone, man! god!

    • Illumina Blade
      Illumina Blade

      I dunno, your hair says sixty but your chin says fourteen.

  • Joseph Blough
    Joseph Blough

    So... if I am understanding this video correctly, the best thing for me to do is keep eating lots of cheeseburgers, play Minecraft all day and remain socially isolated. Got it!

  • Aditya Vikram Singh
    Aditya Vikram Singh

    "No pain, No gain"

  • idot
    idot

    The ultimate dilemma: try to be healthy to live longer, or just hope that human aging can be reversed before you die

  • Mike
    Mike

    Quite possibly my favourite video Veritasium has made.

  • Guy In A Room
    Guy In A Room

    I wanna kms but I also wanna see where this is gonna go

  • Guy In A Room
    Guy In A Room

    Fun fact: he got older during the video

  • WachSein
    WachSein

    As far as I understood it is it only animal protein which should be avoided, or am I wrong?

  • Julius314159
    Julius314159

    Wait a second! The hair growing on my back, shoulders, ears, basically everywhere on my body is a result of faulty cells? It's hair growing where it "shouldn't?" Where exactly "should" hair grow? I always just thought that my high levels body hair, with low levels of upper head hair, was a product of high testosterone, or something to do with my predominantly German/Scottish/Irish ancestry.

  • TempoTrack
    TempoTrack

    LITTLE RIIICCCKK!

  • David Martin
    David Martin

    6 ways to slow aging. 14:26 1. Avoid DNA damage (sunburn, xrays, etc.). 2. Eat less (do intermittent fasting). 3. Eat less protein. 4. Do high intensity exercise . 5. Be super cold 🥶 Cyrogenic chamber. 6. Be super hot 🥵 sauna. That’s the gist

  • BowTie 8 Bit
    BowTie 8 Bit

    Let us make people immortal, but take away the ability to procreate then, because overpopulation! -- What this video is reinforcing is that life is suffering, the more you suffer the longer you live to suffer more, and you have a limited amount of pleasure allowed before you die. The more pleasure and relaxation you experience, the sooner you die.

  • Cooking Parker
    Cooking Parker

    The oceanic spoon socioeconomically harass because employee dfly compete midst a long-term balloon. icy, amuck print

  • KuroiShi
    KuroiShi

    Damn I've been doing some of these for years

  • vcght dfge
    vcght dfge

    The gorgeous machine topically comb because department differently glow unlike a oafish shelf. nervous, deeply offence

  • Jx5hux
    Jx5hux

    Born with congenital heart and lung, was told I might live to get age of 11 if I was lucky. Would be interesting to know when I might die. Born 81

  • no body
    no body

    Aurelia aurita,moon jelly...sounds delicious ! XD

  • Caleb Eckelberry
    Caleb Eckelberry

    this guy look like a nicer green goblin from the spider-man movie

  • NewAmericanConsensus
    NewAmericanConsensus

    If we can extend human life we’ll need to be able to genetically modify humans. If we can genetically modify humans, we can modify ourselves to digest cellulose & synthesize all amino acids from scratch. We’ll be able to support tens of billions of people on earth if we densify our living, grow our food in vertical farms & generate huge amounts of solar power from the surface of the ocean. We can support many more people on earth than we think if we can learn to genetically modify humans. A lot of possibilities open up.

  • DerpyDa
    DerpyDa

    This was in my recommended in 2021.

  • Timof Glazz
    Timof Glazz

    If The animations of cells and DNA in this video is what's actually going on in me... well man... that seems like nightmare fuel...

  • Giulio Brancucci
    Giulio Brancucci

    Very interesting

  • Alfonso Salazar Jr
    Alfonso Salazar Jr

    The third criminal undeniably rub because rotate ordinarily last through a rambunctious celery. defeated, quack protocol

  • Gamzat D
    Gamzat D

    Дерик ну это полный пизьец . Как вышло так что название на русском а ролик на английском ?

  • The Monster Under Your Bed
    The Monster Under Your Bed

    12:51 this is really misleading. To say that monkeys who had restricted diets had less diseases than those without restricted diets doesn't mean that it's healthy to restrict calories, it means that it's more healthy than being obese, but not more healthy than having a balanced healthy diet.

  • The Monster Under Your Bed
    The Monster Under Your Bed

    If professor Sinclair is actually 120 years old, I'll believe his hypothesis.

    • Gamzat D
      Gamzat D

      Напиши нормальным языком . Ничего не понимаю

  • Connor Dayley
    Connor Dayley

    Yes, but what about energy levels? It sounds like an argument for choosing either longevity vs quality of life; quality vs quantity. Both fitness and sport necessitate the consumption of more calories and protein, and personally I am unwilling to give up a higher quality of life--complete with energy and the release of endogenous opiates--in the name of living a longer life of lethargy.

  • francisco prazzio
    francisco prazzio

    Forget living to 150, How about living forever, and have the phyiscal appearence the body, and the enegry of a 23 year old, I would like to live forever since I have over 500 items on my external hardlive that is a lifetime.

  • Justin Matthews
    Justin Matthews

    What the hell kind of garbage person has concerns about the wealthy or over population when talking about saving lives?

    • Clément Berthommier
      Clément Berthommier

      probably people who are aware only the wealthy will be able to afford it and these 100+ year-olds growing populations will need even more ressources to feed when we already don't use said ressources to feed the entirety of Earth's population (which we statistically could). + Mind you, living longer than the average lifespan doesn't equal "saving lives"

  • Khalil Dalbah
    Khalil Dalbah

    This is actually insane if we can actually reverse our steam cells to their older states we might even be able to make them produce specific cells and we can control our body making us bigger for example over 6 feet for everyone remove the dwarf factor from our lifes (first of all i am not a professor nor do i act like one i just saw that they actually fixed blindness soo i think we can fix how tall we are)

  • Sam Kpz
    Sam Kpz

    15:57 anyone else notice? lol

  • 🏳️‍🌈Alison R🏳️‍🌈
    🏳️‍🌈Alison R🏳️‍🌈

    DIABETES IS NOT A HORRIBLE DISEASE

  • Rafael Macris
    Rafael Macris

    know that we discoreved does mechanisms, if we don't make it available for all, guess who will get for thenselves, only the ones who have the knoledge or the money. Does it seens fair to you? Know is too late to don't give us whaterever we have at hand.

  • Amith Deraniyagala
    Amith Deraniyagala

    As long as they don't slow my ageing yeah sure why not

  • scotcheggable
    scotcheggable

    Wait, we can create stem cells from existing cells? The possibilities

  • CENGİZ KHAN
    CENGİZ KHAN

    Take vitamin c 2 gr daily.

  • H Arz
    H Arz

    Lets be honest here, if we get to 100 without any health problems your age of retirement will be 100 too.

  • José Arturo Cano Melani
    José Arturo Cano Melani

    So, if you like confort you're doomed.

  • Th During
    Th During

    THere are very many external factors that influence our aging PROCESS. For all of you who do not know who's 'advice' to take into consideration, "my advice": look around at animals for example, find the pattern and draw your conclusions. If you wish you can comment more on what patterns YOU found. :)

  • Th During
    Th During

    14:10 ... would that also happen with M&M ?.. :P

  • Renee D
    Renee D

    The aggressive halibut remarkably clip because decrease arguably expand apropos a guiltless sandwich. certain, spiritual loan

  • Mike Yearwood
    Mike Yearwood

    We should reduce stupid first.

  • LoskTheCoder
    LoskTheCoder

    16:50 Ahh yes the mouse looks left, look doc this must mean its able to see

  • Nicolas Holmes
    Nicolas Holmes

    is this a travel vlog or a science ...confused!

  • Abdul Rehman Nasir
    Abdul Rehman Nasir

    bro bro bro those 5 tips, thats saitama's training program

  • Mohamed Medhat
    Mohamed Medhat

    "Selfish and destructive"....why not tho?

  • average joe
    average joe

    Selfish comment don’t mind me 14:18

  • S YT
    S YT

    There are a lot of fellow weebs here, not that i not happy about it.

  • KateLovesCats
    KateLovesCats

    I’m guessing 0-15 year olds most will get to witness it

  • Tyler Wallace
    Tyler Wallace

    T-virus time

  • Brick Hart
    Brick Hart

    the fact that we're made up of those wriggly things gave me the jeebes

  • Zsigmond Fórián Szabó
    Zsigmond Fórián Szabó

    8:48 Horváth István :)

  • Max Skullic
    Max Skullic

    I'd like to take some of that one stuff, i'm 37 but have the issues of a 67 year old... my back crapped out very early and now my legs and everything else.

    • Max Skullic
      Max Skullic

      @dunhillsupramk3 I really am disabled, have been since I was 23. Everyday is painful for me, if I could take a drug that could make me even slightly better, I'd take it in a heartbeat!

    • dunhillsupramk3
      dunhillsupramk3

      translation: "i'm 37 but i want to feel like i'm 18 again, i want to be carefree again, i want to eat junk food everyday and not worry about clog arteries, i want to drink and not worry about my liver" dude it ok, its perfectly ok to want this for selfish reasons... i don't think we'll get it in our lifetime anyways (due to this vid being over a yr old and there hasn't been any news or drug testing on humans yet)

  • Bird Skull
    Bird Skull

    As a young cancer survivor, this research is exciting. If nothing else, it could lead to treatments for chronic disease.

    • dunhillsupramk3
      dunhillsupramk3

      well its been over a yr now and no word about drug testing on humans...

  • Boundary
    Boundary

    Wait so intermittent fasting actually does something? I always thought it was just a fad diet.

  • Atheist Community
    Atheist Community

    if the cells don't find conditions to reproduce they will choose immotality.

  • bread & bread
    bread & bread

    The actual question here is should we do it rather than could we do it

  • Funk 4T9
    Funk 4T9

    Hey, where can I get me some of them M&M's??

  • idataec
    idataec

    How come he's 50. He barely has forehead wrinkles 🤣

  • BlocksPlayTV
    BlocksPlayTV

    How cool is a little bit? Like 20 degrees celsius or what?

  • Brian Tawil
    Brian Tawil

    i offer myself to be a test mice lol

    • dunhillsupramk3
      dunhillsupramk3

      well so far no human testing is allowed..

  • WhoCares
    WhoCares

    No AC, running 10km every day, loads of exercise, just a banana for breakfast. Yeah no sounds familiar.

  • TOP 10 EVERYTHING
    TOP 10 EVERYTHING

    just ask the doctors of the queen of England 🏴󠁧󠁢󠁥󠁮󠁧󠁿

  • Brent 13377331
    Brent 13377331

    The last pass ad didnt age well, they don’t allow cross device sync for free anymore

  • Brent 13377331
    Brent 13377331

    The idea of more people making climate change worse is dumb, more people means more people to come up with solutions, and more people means we can feed more people for the same idea

    • Brent 13377331
      Brent 13377331

      @dunhillsupramk3 chinas not a great example due to the one child policy

    • dunhillsupramk3
      dunhillsupramk3

      ahhh you are so correct.. but the longer we live the less we tend to reproduce, for example: back in the dark age and before modern medicine and food security and every 20yrs there was some big war alot of families had as much children as they could (like 6-8 or more was common) but now most ppl have like 2-3 children and in places like China they only have 1 child...