Age is a commonly expressed concern in studying music, and there are many questions on this site addressing "late starts" from a variety of perspectives. This post is intended as Link Central for users with related or similar questions.
If you've found this question, chances are you're interested in learning to play an instrument or in some other aspect of music, like theory. But you are -- or feel you are -- getting a late start, and you have doubts: Is it even worth starting? How far can I go? You are far from alone, both in asking and in asking here. This post will help lead you to similar and related questions that have already been fielded by the community.