He outlasted his brother by quite a while. Managed to travel more miles than nearly anyone else apart from popes and political leaders.
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.
And apart from his film crews who actually shot the footage...