I never thought of an 8th time division world champion would be an underdog. It seems OP has no good analysis when it comes to a match like this. An experience one vs. a new one in this league would overpower the old one.
Maybe, if he thinks that Manny is so old enough for a fight but I do not think coach Roach would allow Manny to fight if Manny is capable.of bringing down an opponent.
Don't judge into final conclusions yet, let's see what manny can do towards his opponent around the ring corner. Age cannot be based on how a boxer can fight, just take more reviews on pacman fights and you'll be enlightened how this Filipino champ had survived his career and became wealthy boxer.