Glenn Johnson. Defeated Clinton Woods (In Britain), Jones and Tarver in succesion in 2004 at age 35, to become the man at light heavy. Started boxing at 21 or 22.
I got a lot of researching to do, but I know Duran goes against my theory. He started pretty earlier in his life
He's an exception Both are more exceptions. I'm thinking my theory only applies to modern fighters :think Ruben Olivarez debut was when he was 17 Holmes's debut was at 23, but it said he started boxing at 19 which is pretty late Foreman was a special case since he took such a long layoff
Calzaghe. Hadn't done **** in ten years and at 34 was supposed to be cannon fodder for Lacy. Then he destroyed him and went on to beat Kessler and Hopkins in my opinion and anyone not on drugs his two best wins.