Minimum age for rhinoplasty and hairline lowering
The growth center for the nose matures when you reach 18 years old so it will be best to wait for that time. Hair line lowering using hair transplantation by follicular unit extraction (FUE) on the other hand can be done at your age.
Minimum age for surgery
Age 18 or older is the legal age to consider surgery. Before that age growth is still likely to be occuring.