[header] How to look older (for pre teens ) [title] Dress like a teen. [step] Look through teen fashion magazines to get an idea of what teenagers are wearing these days. Avoid wearing t-shirts, shorts, and running shoes everywhere and start developing your own style. 
Tone down the bright colours in your wardrobe and avoid wearing things with logos, cartoon characters, or brand names on them. Try layering clothes for a more mature look.