Pre op - excess skin, hair, etc. questions

Hi all! I was just approved for RNY and was wondering how you guys, being in your 20s, have experienced weight loss. I know that being younger our skin is a bit more elastic. Have any of you still needed plastic surgery? What about hair loss? Have any of you experienced drastic hair loss with your surgery? I'm absolutely terrified of this... Having really fine hair to begin with (you can see my scalp around my part), I'm paranoid I'm going to go practically bald. I guess in general I was just hoping to get the 20-something perspective. I'm definitely somewhat nervous about this, seeing as how there aren't THAT many long-term studies that give much information in the way of complications (40, 50, 60 years down the road). Anyhow, any insight would be great!