Hi There:
I thought I'd just add my two cents. I wanted to get my nose and chin done when I was 17 or 18, but my parents wouldn't let me, and more importantly, wouldn't pay for it!
I'm probably getting my nose and maybe my chin done in December. I'm now 25. I wanted to post because your face does change over time...I feel like i have a more "adult" face now than I did back then. My question is whether I would have ended up with a nose and chin that look less appropriate now.
So, you might want to consider waiting - or you might not.