I dunno. A lot of folks have shoulder and other joint problems as they age, often because of injuries or repetitive use at a younger age. I wouldn't necessarily attribute it to shooting a bow. I've been shooting for about 70 years now, including bows in the 65# range in my 30s through 50s, and no shoulder problems. I injured my left/bow shoulder when I was in my late teens, and it does make a lot of noise now when I shoot, and when I do a lot of other things, but it doesn't hurt or limit my shooting in any way. Now one of my knees and hip are another story, but I can't attribute that to bow shooting either. So, I say, if you can do it, go for it