So long as he picks hype jobs and slow ppl like maidana. He won't be. However, if he fights someone like Lara and maybe a very hungry Pac then it might be over for em. Don't forget that Castillo might have unofficially beat him in the first fight. Also, if he continues to his his xylocaine and fight in Vegas, he won't be

Depends when he retires, i think it's three fights he has left with his current contract, I can't see him loosing them three fights.

If I'm honest I think Floyd could go for B-Hops record as oldest ever champ although he is currently 36 no one comes close to him.

Or he retires next year after his contract he will be undefeated

If he goes For Hopkins record, he could be the oldest world champion ever.

Mayweather is a legend and still dominant at 37, but time is faster than everyone.

Like Roger in Lethal Weapon, eventually Mayweather will be "too old for this Sh!t" If he boxes long enough, he will lose.

Most fighters don't know when to quit.

I think he is past his prime and there for the taking.

If he has a brain, he will agree a Pacquiao fight after Maidana then retire as he would beat Pacquiao.

Yes he will ,that's if he decides to move up in weight and fight Andre Ward ,George Groves ,or one of the Dirrell brothers.

Depends who he fights.

of course ! he will not be beaten because he cherry picks easy opponents..

depends on how long he stays around

if he fights keith thurman or danny garcia he will.