I have no idea how that works. Among my wife's four grandparents, the one who outlived them all was the only one with a drinking problem, a complicated list of health issues including lung cancer, and ate nothing his final two years of life but candy and Hawaiian Punch.
Another guy who used to be a farm hand for my father-in-law has survived being hit by speeding cars twice, is a happy and generally unrepentant alcoholic and chain smoker, rejects all vegetables from his diet except what goes on a hamburger, and five years ago fell from the third story of a house he was working on. He shattered ribs, punctured lungs, and died once. He's still living, walks around with a walker, and has so far outlived the rest of his family.
Finally, we had this guy who died when he was 97 years old. I know he never lived what anyone could call a healthy "lifestyle." My grandfather recalls the time when he walked 25 miles from his home to town with a .22 bullet hole in his lower abdomen. He couldn't get the common thread in his home to go through the needle, so he decided to let the hospital sew him up. He was just gonna leave the bullet in there. I mean, what's it gonna hurt, right? He also tried to save dental expenses by trying to fill a tooth cavity with his own melted lead!\
They're the ones who live. Go figure.