Great fighters pull off wins past their prime precisely because they are great and can adapt. If 90s Foreman fought like the 70s version he'd have lasted three rounds before begging for an oxygen mask.

The problem with guys like Roy is he couldn't change. So without doubt a young Roy would've murdered the old one, however, it would be fascinating to see how old Hopkins deals with the young one and that goes for old/young - Calzaghe, Barrera, Pac, Floyd, etc, dozens of great fighters change for the better yet are not necessarily better than their physical prime.