As for Manny he is an old fighter in terms of wars and close to 60 fights. In terms of ring age he is older than Mayweather, even though Floyd is actually older. Floyd's style of fighting plus he has only been in 41 fights make him much fresher than Manny, although I've seen a decline in reflexes and speed.
Manny is like that 20 year old porn star that has been in hundreds of movies whereas Floyd is like the 30 year old wife that has sex only once per year since she got married at 21. 
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