Early 20th century was also 30 years. Ancient Rome was 20-30.
These expectancies were low chiefly because of high infant mortality. A life expectancy of "two days" really drags down your average.
Average life expectancy is not a good measure for everyday arguments. Paleolithic average life expectancy was actually quite high relative to the historical periods that followed.
http://en.wikipedia.org/wiki/Life_expectancy#Life_expectancy...
Early 20th century was also 30 years. Ancient Rome was 20-30.
These expectancies were low chiefly because of high infant mortality. A life expectancy of "two days" really drags down your average.
Average life expectancy is not a good measure for everyday arguments. Paleolithic average life expectancy was actually quite high relative to the historical periods that followed.