How old do you have to be for butt injections?

Hi. I'm 17 and looking into getting butt injections, I'm wanting to have the fat sucked from my tummy and injected into my butt and hips. I don't want too much, just a cute petite booty and thicker thighs . Quats haven't really done much for me! Im just wanting to feel a little more confident in myself . Hoping to have this done for my 18th birthday! Any extra information I should know, please fill me in! Thanks!
