And it's reasonable to think his wealth is buying "power packs", like hormone replacement, that he'd rather not see in the press.
But I would say what may help him live longer than his genetics would allow is the consistency of his health care.
Being rich allows him the luxury of health care, I think this is the biggest factor helping him and being able to eat well i.e. good quality food which is expensive. Even though here in Canada we have socialized medicine and at times it sucks at least it's consistent in that we have the care available. For small problems or major ones it's the daily availability of being able to get help and not waiting until it's too late due to lack of coverage or money to pay a doctor.