He's obviously set for life in at least a 25x mustachian spending level-- seems like a cool dude.
The energy/drive/focus/passion is something we can also pay heed to. As is often the case mentioned but poorly understood or interpreted: If you love what you do you'll never work a day in your life.
Of course, this guy may have some kind of deep-rooted/protestant/work ethic going on and simply can't force himself to 'stop', clearly he has 'enough'.
I see mini handcuffs on the guy but perhaps I'm wrong. He may never 'stop' until his 70s, why, probably because with important positions (chairman, boards, councils, etc) comes great respect and privilege. I believe that is intoxicating. Nobody is holding a gun to his head. Walking your dog sounds great and all but to a person with power, it is much better I suppose to have an entire company or industry hanging on your every word.