I believe that a relationship with a large age difference could be very difficult to maintain. Life is a growing experience. Some people mature faster than others and some never seem to get there. When we are young we feel invincible and rebel against those whose wisdom we feel limits our freedom. We do not give ourselves time to think.We just do what we feel we want and the more others tell us to wait the faster we run towards that which we should not do.
It is true that many of these relationships last but how many ? To the older woman taking on a relationship with a young man in his teens I recommend therapy first. You have to explore why you have chosen this path. Not to belittle the male (for I am married to one and gave birth to one) but in their teens boys are discovering their manhood. Especially in this world where they are sexually active so young the attentions of an older woman is exciting to them. If you feel that this is what you want then give the young man time to grow and reflect. The age difference will still be there in 5 or 10yrs.This will give him time to finish school and pursue a career. If you truly love someone you want the best for them.
To both the men or women who decide to choose a younger mate be sure that the "jealousy demon" is not in you. If you are showing signs of mistrust break it up NOW.