I'm not sure that's true - people died younger, sure, but they also had kids much earlier. Even assuming 18 for first child(and it often was earlier than 18), you'd be a great grandparent at the age of 54 - and people have commonly lived that long even in antiquity.
"While the most common age of death in adulthood among modern hunter-gatherers (often taken as a guide to the likely most favourable Paleolithic demographic experience) is estimated to average 72 years,[169] the number dying at that age is dwarfed by those (over a fifth of all infants) dying in the first year of life, and only around a quarter usually survive to the higher age."
Yeah, I don’t know why people actually believe everyone died at 40 clearly that that’s not true. You’ve met a 40-year-old, right?
Here’s a popular one include all the abortions as deaths and you’ll see that the average age that we live now is also 40
I'm not sure that's true - people died younger, sure, but they also had kids much earlier. Even assuming 18 for first child(and it often was earlier than 18), you'd be a great grandparent at the age of 54 - and people have commonly lived that long even in antiquity.