I got my first pair of contacts at 12, so I don't think age is a factor!
However, if you've never worn them before, you should go to your eye doctor and have an exam done. Even if your vision is perfect, there are still measurements they need to take, and they'll also be able to make sure that your eyes are okay for contacts wearing otherwise. They'll also give you a lesson on how to put them in! (It sounds silly, but if you've never had contacts before it can be tricky, and it's nice to have someone standing by to help...)