Comment by Izikiel43
2 days ago
The problem there is with your definition of grandfather. Currently, the age for a grandfather in developed countries is 55+. For most of humanity's history, if there were grandfathers, they would barely make it to 55 years of age.
No, plenty of people made it to that age in the past. Life expectancy was significantly depressed by infant mortality.
> in the past
What's "in the past" here? Last 200 years? 500? 1000? In evolutionary scale, those numbers are a blip.