No one is "too young" for psi. The only thing that determinds your success is your dedication and if you follow the exercises properly.
I disagree. Physically, age doesn't matter on its own except for social reasons. However, the mind and other bodies are tied to the aging process of the body. For this reason, people at the age of, say, 14-21 in most cases do not have the mental and spiritual (spiritual used loosely to mean non-physical bodies) maturity to undertake work on a serious and abstract level (i.e. working with a system which relies on something non-physical, not recognized by science and ridiculed by most people). For this reason, the grand majority of people who practice psi either corrupt themselves more than they started out or eventually turn to some kind of spiritual path.
You being 14 gives you a very real barrier to progress. Sheer maturity is, as I hinted earlier, the single more important factor in trying to start out on a psionic/magic path. Also, I recommend you not attempt to share your metaphysical knowledge with other people as physical age usually evokes a dismissive attitude in other people; at least not until you can prove what you say logically or prove it physically. For the former, I recommend you study philosophy and some sort of spirituality seriously, as reading texts of a serious and lofty nature tend to exponentially increase understanding and maturity on all levels.
Good luck in your practice.