Shakur Stevenson (20-0, 10 KOs) is a two-division world champion at 26 years old. Now competing at lightweight, he’s scheduled to fight for a championship in his third weight class.
Terence Crawford is 35 years old, Errol Spence Jr. is 32, and neither is getting younger. Both are seemingly still in their careers' prime, but how much longer? Crawford and Spence are widely considered...
