Is 15 Years Old Too Young for Rhinoplasty?

As others have mentioned, growing up with a facial feature you dislike can lead to problems with confidence. Things such as bullying and intimidation are real. That being said, rhinoplasty can often help one's self-confidence but needs to be done in a safe manner. The patient has to be psychologically ready for the change and mature enough to cope with the swelling and "post-op blues".  Also, the body must be done or nearly done growing, especially in the craniofacial area. The youngest I have ever operated on for cosmetic reasons is a 15 year old female and the youngest for a male has been a 16 year old who had not changes shoe size in over two years. In general, however, I wait to 16 in women and 17-18 in males. Hope this helps. 

At 15 years of age, if you are a female and you have not grown anymore, this is the earliest age you can do a rhinoplasty especially if there is both aesthetic and functional deformity. In a male, I like to wait until they are at age 17.

Yes, 15 years is old enough but it has to be a conservative rhinoplasty.  Special attention should be paid to not reducing the dorsum too much. Any work on the nasal septum has to be only minimal to straighten it and no cartilage should be removed.
Regards