I just turned 66, and I had a shoulder repair on the left side six years ago. I am supposed to avoid repetitive motions, and I usually just work through the pain when there is no getting around it. I feel it mostly when I use a broom or have to shovel the snow from my driveway and sidewalk. But then I come in and warm up and play that violin. I get so lost in the process, that I don’t feel any pain as I am playing. My practice time seems to zip by quickly. (Time flies when you are having fun, right??) I guess learning your limits and trying to push the envelope a bit, is the challenge of aging.