How much will a teenager's nose grow from age 14-18?

Dear lillymarieThanks for the question. As the nose is still growing up to around 17-18 years of age I advise my patients to have rhinoplasty surgery after this age. I wish you all the best.

For most females, the nose will reach adult size by the age of 14-15, and for males by the age of 15-16.  If your cousin has already hit her growth spurt, it is unlikely to grow a significant amount from now until 18.  The age of consent for surgery is 18, so the decision of when to have surgery is of course with her parents as well as her.