How old are you?
Read about Norman Borlaug sometime.
/johnny
Average life expectancy in 1812 was 32 years.
Survive childhood and the life expectancy of an adult is much higher.
Don't have 1812 data handy, but
in 1850 a 20 year old could expect an additional 40.1 years.
in 1900 a 20 year old could expect an additional 42.2 years.
in 1950 a 20 year old could expect an additional 49.5 years.
in 2000 a 20 year old could expect an additional 55.7 years.
That's about a 15 year improvement, the same table shows a 36 year improvement for expectation at birth.
FWIW, YMMV...
Where’d you get that stat?