Physically no. I was tripping at 14 as well... If you have a sparked interest in it your going to do it anyways, I honestly recommend doing it, age is but a number. You'll have realizations that will teach you things, maybe make you grow up faster.. But really its not that important, you'll find later that being 14 is something you miss.. I wish I was that young.. Parents house, parents food, no job..
Doing too much tripping will mess with you a little bit.. Its really pretty, and fun, feels awesome.. Just be careful man