Whats up Anch! I would have to agree with most of the members here. If he is still eating and not suffering from any incurable sicknesses then just let him be. He has produced some fantastic fry for you. Now its time for him to take it easy. If his tank is getting boring for you because he isn't doing much but just chilling all the time at the bottom of the tank, You should put some other peaceful fish in there to make things a little more interesting as some of the other members mentioned. A great looking fish. If his clock is still ticking let it tick
If he's still producing fry.... I'd suggest you stash some away for your personal collection to carry on his legacy. Fantastic fish and like K.Flem said.... Let him enjoy his retirement!