"Tonight's the night I've waited for, because you're not a baby anymore," seems innocent enough (not really) until you realize he never makes mention of how old he is or who he is to this girl who he clearly saw grow up. There's never any indication that they grew up together, mind you. Just that he's been waiting, patiently, for this day since she was 6. So, yeah, fuck this. Never mind the gag, I'm actually gagging. I'm disturbed. Tralala indeed, you sick fuck.
Anyway, I guess that leads to this song, with a hard right turn. We've been growing old together for all these years and we'll continue to add years, gray hairs, laughs, tears and all that shit (romance). Life is hard as fuck, but at the end of the day, having someone who knows that and sees you for who you really are, when most people don't, it's all worth it. So, there you go. I love you.