It could be stated that the initial feeling of "love" that a teenager can feel in their first relationship may be solely due to the first time someone other than family has shown them affection. I can tell you that all the relationships (save maybe 2) that i new of my friends in highschool didnt last. Also that the majority of adults say that a teen cant understand love because of the stark lack of experiences.

It could also be said that An adult has been hardened by the same painful experiences that they say give them the idea of love better then a teen. With age comes experience and Wisodm, but it also brings predjudices. This cant be denied. Im an Adult. I should be on the side of the teens dont fully know love, and truthfully part of me believes that. I have given my heart to 3 Girls in my life ranging in time from 5th grade to now (im 23). By gave my heart i meant had feelings for them. 2 I told and 1 was a secret crush. One now that I like is different from the ones when i was younger. My experiences have changed how I view what it can be, but I must admit that the two younger ones were just as real to me at the time. And, that at the best of my understanding at the time, It was something real.

In the end, like I said, experience is why adults say teens dont understand. Experiences shape our views of a subject. But experience is a double edged sword.