PAC longevity is staggering, even if he's not his best anymore it's still phenomenal, all his old foes are long time out of competing at the highest level with the exception of JMM who's longevity is also staggering :good
Seems like fighters who stay within a weightclass too long, their bodies end up fading with age. But going up in weight seems to prolong their physical primes. Im guessing that constantly draining yourself through out your career will take a toll on you, compared to being comfortable being at a weight your body naturally walks at. Just like how Pacquiao and Mayweather are currently fighting at their natural weight they walk in.