In your day, you might have known them as surfer wannabes. Since then, skaters came along and borrowed the long hair and slacker trappings of the surf scene, but they have always been more rebellious.
Look for Vans retro sneakers and oversized tees. They may call each other "dude" and move through the world with their attitude on display.
As a parent, the first thing to remember when dealing with a skater teen is to avoid stereotypes. Yes, a few skaters might be looking for trouble, but most are not. In fact, skaters today are more likely to be devoted to skateboarding as a sport, practicing long hours to land complicated tricks.
Try not to get too upset over those outlandish stunts -- and the occasional sprained wrist. But don't be tempted to try the tricks yourself, either.