[This is a nice article on aging healthily which I found in an archive. The information is relevant not only to the "young once" but also to the younger generation sets.]
Most of us were taught to believe that longevity is 70% determined by our genes, but it turns out that the ratio is actually in reverse. Only 30% of a person’s longevity is determined by genetics, which means the other 70% is up to you. 100? Yes it is quite possible…According to the U.S. Census Bureau, centenarians are the fastest-growing segment of the U.S. population.