I see exactly what you're saying. I guess whether someone truly loves someone else would depend a lot on how long they'd been dating, and the kind of people. I know of a few people that started going out one day and then all of a sudden I'd see written somewhere by one of them, "I love you, So-and-so!" Now that drives me completely nuts. Then on the other hand I see a few kids my age (one of them being my friend) that have been going out for a few years now, and I think they are able to say they know what love is because they've been through a lot and had their relationship ups and downs, but stuck together through it all.
Very good point, though, in the first reply. I have to agree with that, too.