I reckon it'll be a bit like the later Schwarzenegger movies, or more recent David Hasselhoff appearances, they still look around 90% the same but there's just that touch of aging going on, the knees don't flex as much and the wrinkles are spreading out away from the eyes. Or in the case of boxers, the jabs will be slower, the hooks less demolishing, and the breathing a little heavier. I don't think it'll live up to their previous fights, but who knows...one last hurrah for them both with the winner getting a title shot? Could make it an important fight at least.