Very few have done what he has done other than Jordan in my mind. Every single legend prior went on a downswing. I think it's suffice to say he may feel the same especially if he's mentally drained. He accomplished what he set out to do and he's padded his bank account in the process. He's essentially had no life prior to this. He can't eat junk food regularly, pig out, party, basically do things outside of training. His entire life up to this point was built around fighting.
Time to sail off into the sunset.
Marcus Aurelius: Tell me again, Maximus, why are we here?
Maximus: For the glory of the Empire, sire.
Baked, not fried... the healthy choice.