Do you have evidence for that? On the contrary, multiple twin studies have found zero correlation of "shared environment" with longevity: http://econlog.econlib.org/archives/2009/04/do_parents_affe....

In these studies, identical twins who are adopted and raised apart have just as much correlation in lifespan as identical twins raised together, suggesting that genetics (rather than family lifestyle) is the cause of the correlation.

More or less agree, Okinawan-Americans don't have much higher life expectancy than your average Asian-American, which is probably due to lifestyle, but Donald pointed out ^ that extreme longevity appears to have a large genetic component.