Depends on the legal age of voting. Usually, if you under 18 need to undergo counseling with parental consent.
About half of all Plastic Surgery performed in East Asia are for the creation of a 'double eyelid', or blepharoplasty, and about half of these are done below 18 years of age. Rhinoplasty is the second highest number of surgery done in people 18 y/o and below.
Thailand and Philippines have less rigid age limits for Plastic Surgery, and tend to cater to Western tourists for cheaper costs.