If you don't take fashion too seriously, go for casual and cool style in a black turtleneck and black chinos. You could perhaps get a bit experimental on the shoe front and introduce a pair of white athletic shoes to this outfit. Overall, a savvy idea when it comes to style tips for teen boys.
Black Turtleneck with White Athletic Shoes Warm Weather Outfits For Men In Their Teens
Marrying a black turtleneck and charcoal dress pants will create a refined, masculine silhouette. You can take a more casual approach with footwear and introduce white athletic shoes to your ensemble. Outfits like this can certainly make you look older than your age if that's what you want.