If you start thinking you are to old, you will be to old. I was still boxing into my late 30's. I am 68 and still get in the ring to do some sparring. I can't take the hard hits like I use to, so the other fighters hold their hard punches on me, and I do tire, and I am slow, but I can still hit hard, move around, and show a young fighter a trick or two. Nature will slow me down but I don't intend to surrender to a rocking chair. How does that poem go about "do not go gently into the night"?