08:01 AM ET 01.25 | Nearing 50, Herschel Walker is talking about an NFL comeback. To hear him tell it, Walker can still give a boost to any NFL team willing to ignore the date on his birth certificate. He turns 49 on March 3. "If I continue to stay in the shape I'm in now, I know I can play when I'm 50," Walker insisted Monday. ... "Right now, if you asked me if I can play today, there's absolutely no doubt in my mind I can play football, that I can help a team out," said Walker, whose spent his final three NFL seasons primarily as a receiver and kick returner for the Giants and Cowboys. "I can 100 percent guarantee you I can help a football team out."