How did the knee replacement go? I'm 38 but can feel Father Time stalking me sometimes with minor and subtle pains. My mother had one knee done and 6 months later the next. The first was painful but atypically good with minimal bruising swelling and so on. The second knee went more normal and tons of pain, swelling, etc. Said if the knees were in reverse order she'd never have done the other knee. Also said there'd be grown men, ex marines, crying during physical therapy. E-gad!!!
That said, can't complain too much about getting old because many don't get to experience it... And it sure beats the alternative.
Hope it went well.