Note, I'm generalizing.....
Mexicans feel the need to trade, often times.
Mexicans start out sometimes as young as 15 years old.
Mexicans are forced to fight each other on the way up, so it's two guys with the same kind of mindset, I must be tougher. And that hurts you in the long run.
Mexicans prefer to use punch resistance instead of head movement.
Mexicans are usually in the smaller weight classes, and most of those guys, period, retire young because the weight gets to them quicker.
Mexicans can often times become popular and have it pretty quick, and when that happens, it can sometimes kill your hunger.
Some fighters just age fast, as well.
usually (NOT ALL THE TIME) mexican boxers are out of prime by the time they are 30 because they turn pro at from 16-19 years old. Thats young, and they fight in a brawling way. So there body cant take no more punishment and quits on them by that time.
but why marquez is still on his prime? hes 35 ryt?
because he doesnt block punches with his face. although, jmm does kiss canvas alot more than he used to.