@autolycos @RickiTarr Isn't this partly because of high historical infant mortality tho? Pre-agricultural people who made it past 5 had a decent chance of living to their 60's or 80's. But a looot of people didn't make it past five, thus bringing the average age down to into the 30's.
@sidereal @RickiTarr partly
But they also didn't have antibiotics, sanitary sewers, or building codes