Young love: lust touched by wisdom.
Why do I say this, you ask? Sounds a little cynical, coming from me? Nay, I say! Young love is when you lust for not only a mate's body, but his soul, his mind, his company... You feel a deep, heart's desire for all aspects of a person that shakes you to the core. This does, of course, evolve with time into a more mature love; a deeper, abiding, less earth-shattering thing that gives you a sense of peace and wholeness even when the other is absent.
I'll not muse on love as it ages over many years, as my understanding of such is all second-hand at this point. Perhaps I'll revisit this topic in about 20 or 30 years, neh?