Boxing has continued its strong slate of fights in 2023 throughout the summer, headlined by none other than Terence Crawford. Last October, the first edition of this very column was titled, “Will we ever see Terence Crawford and Errol Spence Jr. fight?” On July 29, the two finally met in the ring.

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...