I think you need to move further back. Civilization accounted for a sharp decline in life expectancy due to disease and other factors like extreme agricultural labor. Humans have only gained back what was lost since the industrial and technological revolutions.
Extant hunter gatherers, living without access to modern medicine, have been studied to show life expectancy closer to 70.
Extant hunter gatherers, living without access to modern medicine, have been studied to show life expectancy closer to 70.