So, I’m at the age- or beyond- when knees and hips seem to go. Too many of my friends have run their last marathons. No longer can they “shake it off” after a few cortisone shots and a slew of OTC (over-the-counter) painkillers. (I hope I’ve escaped this problem- because I swim and ride bicycles. These pose infinitely less stress on one’s knees and hips.)