I think he needs to hang the gloves at his age and respect Grandfather Time at this point. Not that I doubt his skills, but he's basically just too old for the sport that most blows that he receive are becoming more and more dangerous to him.
He is the only one who can decide that. You cannot compare a boxer to an average person because it depends on the discipline of a boxer. And as we can see, despite Donaire being old and having suffered a painful defeat at the hands of Inoue, he still wants to come back to boxing and aims to be a champion again. You can be impressed by the kind of dedication he has in his sport, so let's respect his decision and hope that he won't suffer a serious injury in case he loses a fight.
I'm impressed with his longevity and his power as a fighter, no doubt. Then again, it is in the nature of the human body to deteriorate over time. No matter your discipline is as a fighter, a warrior or whatever, time will be your strongest enemy to stay in the game. Your body is more susceptible to damage, and it takes a lot more time for it to regenerate, sometimes not.
Donaire will have the final say, but he needs to really think it through.
