Is it common to develop Carpal Tunnel Syndrome at age 14?

I've asked questions before about CTS and mentioned my symptoms and how I have been playing bass clarinet, piano, and clarinet for almost 4 years now. I play almost 5 hours every day and when I'm not practicing, I'm either writing or on the computer. I hear all of the time that it's not possible to develop CTS at this young of an age, but when I think of my symptoms and the ones for CTS, I get so confused. Is it possible for it to develop at my age due to my activities, or is it something else?