"To continue playing, really, the only argument is I can because I'm in great shape," Allen said. "But just because you can doesn't mean you have to. Many people over these last couple of weeks have lobbied for me to continue to play. … My argument for not playing is, I have done a significant amount in my career and I appreciate everything that has come my way and as I've gotten older, I'm 39, there are so many things in life I want to be able to do to affect change — like being around kids full time, which I enjoy.