If we look again at the estimated maximum life expectancy for prehistoric humans, which is 35 years, we can see that this does not mean that the average person living at this time died at the age of 35. Rather, it means that for every child that died in infancy, another person might have lived to be 70. The life expectancy statistic is, therefore, a deeply flawed way to think about the quality of life of our ancient ancestors.

source: http://www.ancient-origins.net...