This 49 year old, Bernard Hopkins, will be defending his WBA and IBF lightheavyweight championship on Nov 8th (HBO televised) in a unification fight with WBO champion Sergey Kovalev.

He's known for doing 10 daily miles of roadwork whereas most fighters do 3 to 5. That couldn't have hurt him any although most fighters would cook themselves over-training at that along with everything else they do.

I once worked for a guy on a paving crew that didn't retire until he was almost 80.