Just worked on a teenager recently.  I really enjoy getting to work on that age group, they have a surprising amount of stress and tension in their muscles for such small bodies!  With all the growing that is done during those years and the stress from school and athletics, it is really beneficial to hit that "reset" button for their bodies.  Studies have shown that massage is really beneficial for self esteem and self image, and it can be a real morale booster for these young people.