I agree with MMM, in that hormones play a vital role to defining what "young love" actually is. Contrariwise, I agree with Misa in that experience and maturity also play a vital role in the self definition of what love is for the individual and their partner.
But who said we had to live in a binary system? It's both.
Love is a biological function as well as a mental and emotional operation. Giving chocolates, for example, is an emotional way of showing you care for someone, and chocolate itself contains chemicals that release endorphans (sweetGodI'mnotabiologistandIknowthat'satypo) that give the impression of being in love. Misguided love or misinterpreted love may be an imbalance with endorphans(againI'mnobiologist) combined with the lack of experience to personally define what love is for them, not having any personal evidence to cite from. It's a fine line, but it's a complicated process, one of which younger people just can't wrap their heads around, mainly because, in a sort of begging the question, they're too caught up in their love to understand that it may not be that which they're claiming it to be.
I wish there were a simple answer to this, and I wish I knew how to spell endorphans(
).