My ancestors were primarily farmers and spent most of their lives outside, in the sun; most lived well into their 90's unless they were killed in one of the many wars our families have participated in... During the civil war, most of the boys on my father’s side (in their early teens to early twenties) were killed (three in one day); this could skew the “life expectancy” figures quite a bit on its own.
My mother who is now in her 70's has mentioned this on several occasions; disbelieving the miss-information on life expectancy we are fed.
The "average" life expectancy information we are spoon fed is a bunch of bunk and in no way reflects quality of life; my ancestors, who lived through the wars usually all worked and/or played up until their deaths, most often going to bed for the evening or a nap and not waking up.
It was not until the end of my grandparents generation (industrial age generation; 1900) that our family started noticing a DECLINE in our families life expectancy AND in quality of life.