>>512711544
Holy fuck retard. In the first place, it was 35+. But more importantly, that was the "average life expectancy from birth". If one person dies at 70 and one dies a week after birth, the average is 35.

What brought down the average was high infant/child mortality. Which was primarily caused by babies having extremely weak immune systems.

If you didn't die as a baby, the average life-expectancy was more like 65. But this varied over time and place. For example, in the Paleolithic there was little to no war, and very few, if any, communicable diseases. Basically, you didn't need vaccines because there was no measles to spread around. No STD's either. The "Western Hemisphere" was itself largely free of disease prior to Christopher Columbus(which is why so many natives died of disease from Europeans and not the other way around).

War and other organized violence largely wasn't a thing until agriculture. The "Aryans" were the most murderous people of all time. They would make the Mongols blush.