If you’re an older adult, you’ve probably fallen into the trap that one doctor calls “ the narrowing .” “Most of my patients have no idea it’s happening. They think it’s just aging. It’s not,” Dr. Howard Luks, an orthopedic surgeon, wrote on X. It’s simple: What you believe your body can or can’t do becomes true. But the important thing to know, Luks stressed, is it’s not inevitable — and you have a lot more control than you think. Luks sees it all the time, more than he sees injuries or