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Does the human lifespan have a limit?

nature.com

71–80 of 227 posts

Re: Does the human lifespan have a limit?

#71
post #67

Earlier quoted context omitted.

Antediluvian lifespans were order of magnitude greater. Methuselah was, I think, over 900 years. After the flood the lifespans became significantly shorter.

or maybe they used lunar calendar, 900 years are actually months...

Then you have people becoming daddies at the ripe old age of ... 5.

Re: Does the human lifespan have a limit?

#72
post #2

If we consider the average lifespan as say 80 years old, I find it quite interesting that no single human ever has achieved even close to twice that age.

If we consider the average height as say 160 cm tall, I find it quite interesting that no single human has achieved even close to twice that height.

Re: Does the human lifespan have a limit?

#73

There's an old quip that the greatest correlation for a country to have supercentenarians is them not issuing proper documentation at birth 120 years ago. So yeah, currently there's a hard limit - around 100, more or less, but with life seldom being worth living after 90. I really wish we'd start investing in breaking this. I'll happen at some point, the only question is when, and I'd think it's obvious why we'd want…

I don’t think the point of living beyond 100 years old is the years that come after you are 90 (pretty bad years), but that one has more “nice” years to live. Example:

- average person who dies at 80. Middle point in his life at 40. At 20 the person has already lived a 1/4 of his life.

- imagine a supercentenarian who dies at, for the sake of examples, 120. This person at his 60s is like the average person at his 40s! If we consider that for the average person his “sweet years” end at 35, a supercentenarian’s sweet years end at 51!

Re: Does the human lifespan have a limit?

#74
post #2

If we consider the average lifespan as say 80 years old, I find it quite interesting that no single human ever has achieved even close to twice that age.

Well, we already have a lot of medical interventions that skew our species' "normal", pre-civilizational population tree towards something never seen in nature. In a Stone Age society you would definitely find people twice as old as their group's average lifespan. But that average lifespan would be rather low.

Didn't most people live to their 60s if they survived childhood and pregnancies?

Re: Does the human lifespan have a limit?

#75
post #2

If we consider the average lifespan as say 80 years old, I find it quite interesting that no single human ever has achieved even close to twice that age.

If we consider the average height as say 160 cm tall, I find it quite interesting that no single human has achieved even close to twice that height.

Well that is interesting too. The same does not appply to weight. But for some reason I find the age distribution more curious.

Re: Does the human lifespan have a limit?

#76

Earlier quoted context omitted.

I think the GP just means that the tail of the age bell curve seems (surprisingly) short to them. The implication being that when doing statistics with a large number of data points, you often see several outliers that are way outside the curve. In the case of age, the tail of the curve falls to 0 very quickly.

We've done a lot to shift this away from a normalized curve, which feels very unfair to us as humans, to one where more people have a chance to live to a longer age. We've spent much less effort trying to extend the longest lifespans. This seems totally rational to me.

It seems strange for some people because they imagine this "average" as a classical mean and the intuitive shape of the bell curve - the biggest chunk must be in the middle ("for every child that dies at birth someone must live to be 160 to have the 80 years average where most people should be") rather than a statistical life expectancy. We substantially reduced a lot of the external factors killing us early (disease, war, accidents, etc.) and we're hitting the real limit of human lifespan. We haven't addressed this because we don't have the tools yet. So all the work was to push the curve to the right because that benefits most people and it has a lower threshold to achieve this, without actually pushing the tail end further right because it benefits very few and it seems like an impossible task today.

The average speed for an F1 race might be 250Km/h. This doesn't mean any of the cars can ever hit close to 500Km/h. Just that we eliminated most of the reasons cars were slowing down and were left with the fundamental limits of the car's speed as dictated by it's engine, grip, aerodynamics, or weight.

Re: Does the human lifespan have a limit?

#77

Earlier quoted context omitted.

or maybe they used lunar calendar, 900 years are actually months...

Then you have people becoming daddies at the ripe old age of ... 5.

Didn't this actually happen somewhere in Peru in between two worlds wars?

Re: Does the human lifespan have a limit?

#78
post #73

There's an old quip that the greatest correlation for a country to have supercentenarians is them not issuing proper documentation at birth 120 years ago. So yeah, currently there's a hard limit - around 100, more or less, but with life seldom being worth living after 90. I really wish we'd start investing in breaking this. I'll happen at some point, the only question is when, and I'd think it's obvious why we'd want…

I don’t think the point of living beyond 100 years old is the years that come after you are 90 (pretty bad years), but that one has more “nice” years to live. Example: - average person who dies at 80. Middle point in his life at 40. At 20 the person has already lived a 1/4 of his life. - imagine a supercentenarian who dies at, for the sake of examples, 120. This person at his 60s is like the average person at his 40s…

I beg to differ. In my opinion, life doesn’t really start until you’re 25 or so, maybe even 30. The first 18 years are generally spent at home, following other peoples rules, and learning how to get by. The next few years you get your independence and start finding your place in the world. If you went to college, then you enter the workforce and are probably getting by, still finding your footing.

Then the real fun starts.

I just turned 40, and feel like I’m finally hitting my stride.

Re: Does the human lifespan have a limit?

#79
post #74

Earlier quoted context omitted.

Well, we already have a lot of medical interventions that skew our species' "normal", pre-civilizational population tree towards something never seen in nature. In a Stone Age society you would definitely find people twice as old as their group's average lifespan. But that average lifespan would be rather low.

Didn't most people live to their 60s if they survived childhood and pregnancies?

Yeah it depends whether you count all of the infant deaths in the average.

Re: Does the human lifespan have a limit?

#80
post #11

Whenever this topic comes up, I’m always reminded of the fact that the bible knew of this long before any statistician. 'My spirit shall not abide in man for ever, for he is flesh; his days shall be a hundred and twenty years' (Gen. 6:3). As a non Christian this always baffles me.

How many numbers are in the Bible, and how many of them are wrong (which we conveniently gloss over). The world was made in 6 days?

Asimov had a possible explanation for 6 days: http://www.sumware.com/creation.html
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