Some folks are just healthier. It's a single data point. Who knows if it has anything to do with his diet? Staying fit and avoiding tobacco are proven to extend life. His specific dietary restrictions? Meh, who knows?
My grandmother lived to 95, and was very healthy into her early ninties. Her diet, while generally good, made plenty of room for curries and lager, and she liked to get pretty sloshed on her birthdays. Single data points: Useless.
