Are Silicone Breast Implants Legal for a 21 Year Old?

Dear Sara,
The FDA has not approved silicone breast implants in women under the age of 22 years for cosmetic breast augmentation. The FDA has approved saline-filled breast implants for augmentation in women ages 18 and older. For breast reconstruction (i.e. reconstructive surgery to restore the breast after cancer treatment or trauma), silicone implants have been approved for women of any age.
Because you are most likely looking into implants strictly for cosmetic purposes, you will not be able to get silicone gel implants until you reach the age of 22.
Hope this helps. Best of luck.

If you are fully informed and sign a waiver/informed consent document along with a parent/legal guardian, if under legal age allowing off FDA label usage of a silicone implant then you can have these used even for cosmetic purposes and is legal. You are right that it probably invalidate the company's warranty.

As of November of 2006, women over the age of 22 years old are eligible to receive silicone breast implants under the guidelines established by the FDA. This requires you to review and complete prepared materials and informational brochures.

You are almost there.  Unfortunately, a board certified PS will not give you silicone implants until you are over the FDA approved age. 

Sara,
Great question. I've dealt with this once before. This patient was 21 as well and came to visit me from out of town. Because she had almost no breast tissue at all, it was clearly the better implant to use (silicone) for many reasons. I sent her off to return to me in a year. Needless to say, she came back with really big saline implants that just didn't look right, but she made all of the choices and signed all of the paperwork. I may be wrong, but it seems that all that paperwork is not necessarily intended to protect the patient.
I think that some would do your surgery with silicone implants despite FDA recommendations because its not illegal. This is an elective cosmetic procedure and those are the product recommendations.
Although I don't think the FDA necessarily makes all logical choices, their intention was originally meant to protect patients. Making you sign a series of consents where you accept all blame doesn't seem right to me but you won't struggle to find someone that's perfectly fine with it.
I don't regret not having done this patient's surgery, in fact, she's already talking to me about switching them out for a different size. My suggestion is for you to talk to your plastic surgeon and see what he recommends. If he tells you to wait and you bonded with him and trust him.. you should probably wait. Keep us posted on what you ended up doing, I'd be very interested in knowing.

In my opinion, there is no good reason why there is an FDA  mandated age of 22 for patients to receive silicone breast implants. There are many patients under the age of 22 who would ( based on their body type and the advantages of silicone breast implants) benefit from the use of silicone gel breast implants. Unfortunately, the use of these implants for these younger patients will negate the breast implant manufacturer warranty.I hope this, and the attached link, helps.