Can't help you on the knees but my golfer's elbow has been helped by two cortisone shots and a treatment where they infuse medicine into you through an electrical current (something-pheresis --- help Jerimiah!). After hanging around for 3 months, it's now gone. I'm also working on strengthening the forearm muscles through wrist curls. A good PT should be able to help you. Just doing nothing didn't help me.
As for your age, you wouldn't be on this site if you weren't active. My lessons learned, though, are: don't try to progress too quickly, the O lifts are far trickier than they look, and give yourself time for recovery