I would like to say, some of these sound smark aleky, but that's for entertainment. The answers are actually sincere.

Wear sunscreen. Nah, too much work.
Enjoy the power and beauty of your youth. Yes, I refuse to grow up
Don't worry about the future. See above
Do one thing every day that scares you. Scary things are scary
Sing. I do, everyone tells me stop it.
Don't be reckless with other people's hearts. That's good advice and I try not to. But I'm just so smurfing charming I can't help it.
Don't put up with people who are reckless with yours. I do, just write them out of my life. Guess it's karma though.
Floss. Nah, too much work.
Don't waste your time on jealousy. I have everything I want and nothing to be jealous of.
Remember compliments you receive. I do. It makes me feel all warm and fuzzy inside.
Forget the insults. Can't, I'm am a very spiteful person. Over half of what I do is driven from spite.
Keep your old love letters. Nah, too much work. Easier to chuck them into the fire place.
Throw away your old bank statements. I can't. I like seeing how much money I had.
Stretch. I try to, but don't always get to it.
Don't feel guilty if you don't know what you want to do with your life. I don't, I'm awesome.
Get plenty of calcium. I do try to drink lots of milk.
Be kind to your knees. That's what she said.
Whatever you do, don't congratulate yourself too much, or berate yourself either. But I'm awesome.
Enjoy your body. Every night.
Use it every way you can. Every night.
Don't be afraid of it or of what other people think of it. I don't.
Dance, even if you have nowhere to do it but your living room. I really do this.
Read the directions, even if you don't follow them. Always.
Do not read beauty magazines. Always
Get to know your parents. Of course.
Be nice to your siblings. She's annoying.
Understand that friends come and go, but with a precious few you should hold on. Couldn't agree more.
Work hard to bridge the gaps in geography and lifestyle. I like to think I know a lot of types of people.
Live in New York City once, but leave before it makes you hard. I'd like to go there.
Live in Northern California once, but leave before it makes you soft. Not there though.
Travel. I'd like to get out of the country too.
Accept certain inalienable truths: Prices will rise. Politicians will philander. You, too, will get old. I refuse.
Respect your elders. Old people suck.
Don't expect anyone else to support you. I don't.
Don't mess too much with your hair. Comb it once when I get up and I'm done.
Be careful whose advice you buy, but be patient with those who supply it. Always courteous.