I'm 53 and what I have noticed most is that I have to work more diligently on conditioning. For example, I can't hold the string back as long unless I put a lot more work into conditioning my upper body. I still pull a 70# bow, but I can see that these days are numbered. This decline in physical ability, i'm sure, also must effect accuracy. Although I am still very aware of my limitations, I am not sure that accuracy has deteriorated to a material extent, yet.