[font=trebuchet ms]You're at the perfect age to get into it!
If you were younger, you'd have to deal with issues that arise when you hit your 'growth spurt' and nothing seems to fit anymore, including the guitar. You're at an age when you can learn quickly, and you have enough enthusiasm to carry you through the rough spots that we all encounter.
And, here's the best part - you have time to devote to learning/practicing/playing! In a few years, you're going to find that school, work, and a bunch of other things are all competing for your attention. Right now is the best time of your life to get serious about playing guitar.[/font]