Good genes, I dunno about that. He's just the best version of himself, something most of us are not.
Like I say it takes unreal amounts of dedication over a lifetime to achieve a physique like that, never mind to sustain it, but men well into or past middle age with that kind of a body are - and make no mistake about it - getting medical "help" to do so. TBH I have little enough issue with that and think if someone wants to do that, work away and it's better and safer if it's out in the open and under medical supervision. What I do have an issue with is some giving the impression that results like that are all gym and diet based, when clearly they're not.