Well, one brother lived til 90, which is still above average, and iirc he only died because of complications of a fall and would have lived longer without that bad luck. And one other brother who lived to 84 and was taken out by a rare neurological disease.

So it's probably just that he has genetics for longevity in his family. And they were all wealthy which helps

Desperate not to let anyone else have a go at his job.