Yeah, but you have to realise that our Paleolithic forebears with their massive skulls and jaws dropped dead at the age of 30. Infant mortality was stupendous. Frankly I think they simply cannibalized defective or weird looking kids.
Thats often quipped but its not actually correct. The
average was low, i.e life expectancy was low, because of numerous factors: high infant morality, wounds that would be easily treated now leading to fatal infections, tribal/fraternal warfare, deaths by wild animals, death by misadventure, etc.
They have found remains they estimate to be those of 70 year olds, and they were quite robust, so its not true that our forebears didn't have the capacity for long life...rather the environment was often the result of their demise.