Don't make so much of it Lowell. If the mind stays sharp it will always be able to make the legs get going. I could tell you stories all day long of 70+ year old men who are still going strong. My own father is 72 and has had both of his knees replaced twice (he wore the first ones out) and still works 40 hours a week in my steel fabricating shop and then goes dancing every friday night like he is 25. Short of a truely dibilitating condition if there is true desire in your heart you'll find a way.

Bill G.