>>409971243
>>409970741
>>409970437
Not him but I found a bit of what he was talking about, I'd post more of it but it's a rather obscure topic that brings up tons of other things as well.

>People today typically live long enough to become grandparents, but this was not always the case.
>Recent analyses of fossil teeth indicate that grandparents were rare in ancient populations, such as those of the australopithecines and the Neandertals. They first became common around 30,000 years ago, as evidenced by remains of early modern Europeans

>Our initial findings, supplemented with scans provided by the Max Planck Institute for Evolutionary Anthropology in Leipzig, corroborated Wolpoff's results and validated the wear-based seriation method: the Krapina Neandertals had remarkably high mortality rates; no one survived past age 30. 

>Based on data from Neandertals and contemporary hunter-gatherer populations, we inferred that fossil humans got their third molars and had their first child at around age 15. And we considered double that age to mark the beginning of grandparenthood—just as some women today can potentially give birth at age 15 and those women can become grandmothers when their own children reach age 15 and reproduce.

All of this is also old data, the numbers were refined and lowered even further from here as of the last 5 years or so as anon mentioned. Dude just doesn't want to google for you lazy fucks like I did or he can't find shit, I can't find the more recent stuff as I want to play video games and you're all slobbering retards that don't even deserve him trying to educate you to be honest.