Are you 11, 12, 13, or 14? Do you ever want to seem just a tad bit older, like 16 or 17? Then this is the article for you.

[edit] Steps

Don't walk around wearing T-shirts that are from charity event such as the red cross or a shirt from a class field trip.
Be different. Jeans are cute, right? Boot-cut, skinny, cropped, high waisted, flared. The options are endless. Except when you always wear jeans you start to look kind of like you don't want to stand out.
Don't always wear sneakers or flip flops. That's kind of boring.
Have different types of purses. Have them so that they go with your clothes. Such as a brown, leather purse that goes nicely with that adorable dress. Don't wear the same purse day after day. Also it doesn't matter where you got it. From Prada to K-mart, a purse is a purse.
In your purse, have your cellphone (you need a cellphone to seem older), a tube of lipgloss, a stick of lipstick, a wallet with at least five bucks in it (or a a cute coinpurse), a mini hairbrush and finally, a compact mirror.
Make sure you read a good teen book series!

[edit] Tips

When you go visit grandma on Thanksgiving and all your relatives are there wear your nicest purse, an A&F, AE, Aeropostale, Abercrombie, or Hollister shirt. A blouse will also do it if it looks mature. Then put on a denim mini or a flowy knee skirt. Also, do your nails ahead of time. Wear your nicest ballet flats or heals. *Whatever you do, do not match with an older or younger sibling! That brings the 'how cute' jokes out that makes you look about three years old.
Smile a lot and listen attentively.
Laugh when adults laugh.