Sonny Liston. No one knows how old he was. Probably 45 when he KO'd Patterson to win the title. Foreman would come in second. Archie Moore was great for sure, but I think he was a bit lucky Patterson let him keep the light-heavyweight title. Then again, some say Patterson was lucky because Archie tanked for him.
i'm not saying its hopkins, not saying it at all.. but, what an amazing achievement it would be if he beat pascal and at his age beat the best light heavyweight champion out there. i dont know if he can do it...but it'll be part of boxing folklore, or should, if he does.. an amazingly good boxer in my eyes.