 Say you get hip replacement surgery at 40. Well, the average lifespan of a prosthetic is maybe 25 or 30 years. So a long time when you're 65 or 70, during your expected lifespan, you may need a second surgery. That's a big deal. So to the extent you can defer it, defer it. But don't hesitate to get joint replacement surgery if it's really slowing you down. All right.