You would be surprised though as to how much genes play an important part in determining how long one will live. I've seen old fat people who never did a stitch of exercising live into their 80's and 90's! I had 3 good friends who exercised a lot and ate all natural and vegan diets were in great shape die before they got to their mid 50's. Of course I side on the exercising course of life, so I'm not saying do whatever because it won't matter, but still there is an element of genetic background that can upset well laid plans, or extend lives of those you wonder how their doing it.