Boxing??
Scooter,
You are only too old if you think you are. Nobody is more qualified to make that call than you.
I've tried to live my life by the following saying. The worst thing that can happen to you is, when you get physically unable to do anything, and you see someone doing something that you had always wanted to try, and you say to yourself, "I wish I had done that".
You may never be a "champion", but I'll bet you already are in your son's eyes.
dgh