^^^^ What Phil sez.
John, you haven't gotten there yet, but add another 10 years or so..
At least you are *aware* and doing something about it. I quit on my previous airplane project because I'm not supple enough to get in it any more.. I can still ride the Mighty Scura though..
Edit: The other "Chuck in Indiana" has 10 years on me, does yoga 2 or three times a week, and is amazingly flexible.