what are some of the factors that allow him to have success at the elite level nearly into his 40s? He has a high level of textbook purity and is a thinking man's fighter. He has been in his share of wars and is a little man.
Yes, he's taken some hellacious shots and has somehow preserved himself like few others. Probably it boils down to hard work and a healthy lifestyle.
He looks like somebody who takes care of himself during fights. No weight gaining, no drugs no alcohol etc. Similar to sexy Sergio.
Never having Breaks, year round staying in shape just like floyd, You won't ever see marquez partying it up either... he is the definition of a 24/7 365 Professional athlete
Also he's been in a few wars IMO, not that many and has only been KD never stunned... His style allows him to never take much punishment.
The rivalry with Manny Pacquiao has helped him.. Manny has been his inspiration.. since the 1st fight in 2004, it's been all Manny Pacquiao running in his mind.. he moved up in weight class just to follow his nemesis, and he even go to the Philippines to ask for a rematch.. The opponents he fought in between 2004 to 2012, he just wished that it was Manny Pacquiao.. (Knocking Out Juan Diaz, Katsidis, Casamayor etc.)
seems to be the type of guy whos whole life revolves around the sport (no partying, drinking, always in shape) has a good boxing style that keeps him from taking big amounts of punishment as someone said the inspiration of getting the W agains Pacquiao in his record kept him training hard