If I am 18, is it possible to get other implants besides saline?

Silicone gel implants have been FDA approved for patients 22 years and older. They can still be used as an off-label device for patients under the age of 22, but the warranty on the implants will be void. The only way to use the implants with the implant warranty would be if you have a reconstructive, congenital, or severe asymmetry/condition that necessitates the use of the gel implants in lieu of saline implants. 

Hi Kylierae. Doctors can use silicone gel-filled implants in cosmetic breast augmentations for women 18-21, but it's considered "off label" use of the product. That means it is at the physician's discretion when or if to use these implants in a way that has not been specifically approved by the FDA. Also, the manufacturer's warranty is invalid in cases of off label usage. Discuss your options with a board-certified plastic surgeon who will help you to understand the pros and cons of both saline and silicone-filled implants. Then the two of you can make the implant choice that is best for you and your situation. Good luck!