Despite telling Ariel Helwani that he'd be competing into his forties, it is pretty hard to believe that CM Punk will still be doing this in four years time. MMA is a young persons game and Punk is already severely injury prone. He noted just last week on Colt Cabana's podcast that he's had thirteen concussions in the past. That is not at all encouraging for Punk's MMA career. Heck, he might not even be in condition to survive a training camp or get past UFC's physical testing. There's also been knee injuries and other ailments, and that's just in fake fighting. It is really, really difficult to imagine that CM Punk can forge any more than three to four years in the UFC.
