At 53, he has already noticed that the wear & tear is showing up. Well, it's showing up internally too, in things he might not notice. Blood pressure, various cancers, and on and on. At 52 I had a CT scan to find a kidney stone. It was cancer which was caught early enough to resolve with a partial kidney removal (15%). It has been 5 years now with no recurrance. Needless to say, I now have doctor religion. Kick his butt all the way to the doctors office if you have to, but do it. It is up to you!