I think Floyd realizes this and has been developing his style to cope with a less responsive body. He's got the perfect fundamentals, so it's much easier for him than someone like Roy.
Floyd jr is 34 with 41 fights who's on "long vacations" it's obvious that he stays in shape so he's always good to go with less wear & tear, I don't think he's on a decline. Pac on the other hand is 32 started pro boxing a year earlier than PBF with 58 fights he's got more wear & tear which is like a tire wheels waiting to get busted during a long drive. I wouldn't be surprise if Pac gets old on the ring.