>no one lives forever

Genetics plays a huge role when it comes to long life. His parents/grandparents lived quite long. He has access to the best medial care possible today. Of course he isn't immune to death but if he has no cancer/heart failure, we can expect him to live till his 80s.

The thing is, a lot of cancers can be cured if detected early. I have no doubts that they examine him regularly. He has trained for most of his life, isn't smoking, isn't drinking and is a health nut in general. All ingredients are there, we better think a way to assist his death otherwise it isn't very likely.