How can I look older? Help!?

Ok, I know what you're thinking. "Why would you want to look older? When your 45 it'll look like your 35!"

I know that, but I want to look older now, not then.

Okay, so I'm 5'1", fourteen, thin, I have medium-long dark brown hair, brown eyes, professionally waxed brows (they look kinda like this —> http://iamchiq.fooyoh0o0com/iamchiq_beauty… ), clear braces, & tan skin.

I usually wear PacSun, Forever 21, AE, some Hollister, and barely any Abercrombie.

Every one I ask says i look about 11 or 12 years old, and I hate it. How can I look my age (14) or older?