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This is mainly because of child mortality. When you get five children, of which two live to be 78 and 89 and the other three die at ages of 2, 14, and 8, your children's average lifespan is 38,2 years. Typically, you either died very young, or you lived old. And the average is, well, the average of those. Basically nobody died around the age of 38.
Tribal nomads of 100000 years ago did not live anywhere near to their 60's.
AFAIK they rarely lived beyond 30.
https://www.discovermagazine.com/what-was-the-life-expectancy-of-ancient-humans-44847
Note that Lifespan is not the same as life expectancy:
https://my.clevelandclinic.org/health/articles/lifespan
So 30000 years ago 30 years was pretty much the maximum age a person could achieve.
Life expectancy would probably have been around 15.
In this article it is, though. That's why they use the phrase "average lifespan". There is no "average" in maximum.
In the article the phrase "average lifespan" is used in the meaning "average life expectancy".
Average disregarding race or culture, spanning thousands of years.
That still doesn't mean 30 was the maximum possible age for humans 30,000 years ago. The ratio of older to younger remains doesn't mean a whole lot unless you can prove death from old age.
It's not like we have a plethora of remains to draw these conclusions from.
Yes actually it does, above 30 would be an outlier.
Of course genetically they had about the same potential as modern people, but life was simply too harsh for people to survive above 30. The struggle to survive meant they were simply worn out at that point.
We see this even today in nomadic tribes in the rain forest of South America.