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Can a 47 year old ex NFL football player compete in mixed martial arts? Absolutely not! Aging running back Hershel Walker has announced his intentions to become a fighter. Is he serious?Does he think MMA is less physically demanding than pro football? There was a reason he retired from the NFL and those same reasons apply now more than then. Alas, this is the inevitable fallout of the Brock Lesnar era. Nothing a good knee in the clinch won't fix.