Skateboarding is the act of rolling on or interacting with a skateboard. Someone who skateboards is called a skater or skateboarder. Skateboarding can be a hobby, a sport, or a method of transportation. It is often considered part of the extreme sports family or, because of its creative aspects, an art form. Skateboarding has been shaped and influenced by hundreds of skateboarders throughout the years. A 2002 report by American Sports Data found that there were 12.5 million skateboarders in the world. Eighty percent of skateboarders polled who had used a board in the last year were under the age of 18, and 74 percent were male.