I'm fifteen, and I'm turning 16 in 7 months. Although I'm a 10th Grader, most people at school who don't know me will often assume that I'm a 7th Grader (the youngest grade in my school). Which means most people think I'm about 12. I bet if I didn't have my uniform on, people would think I'm even younger! <_< Most people in 10th are often suprised to find that I'm actually the 11th oldest student in the 10th grade!
It has its ups and downs. Often when other students ask for solutions from other students, they won't take mine seriously because they think I'm "Year 10's Little Kid". But it can be helful because sometimes they may go easy on me in a game, because they think I'm so fragile. ^_^