Right, Angel is a pedophile. He fell in love with Buffy when she was 15. And when Spike was with Buffy, she wasn't a teenager anymore. If Spike was with Buffy at the age Buffy was when she was with Angel, he would have been a pedophile as well. So Spike at his age and Dawn at the age of Buffy back then, it is very icky. But that's a little off topic.
Well, to play devil's advocate a bit, vampires falling in love with teenagers doesn't ever seem to get frowned upon much in fiction, considering they stay young forever (physically, at least, not really
mentally.) In Angel's case though, he's a vampire trapped in the body of a man in his mid-20s so it's still awkward, and if he were a human he'd be one of those guys people around town whispered about. Angel even lamented to Buffy (in "Reptile Boy") something like "I knew this would happen... I'm over 200 years old and you're a 16-year-old girl," implying that their maturity levels were off, but not that there was a big creep factor.
But when Angel
first saw Buffy through the window (at 15) did he
fall in love with her or did he just want to
help her? Maybe somebody can help me out, cuz it's been a while since I've seen "Becoming."
As for Spike, he was what, 18-20 when he turned into vampire? Slight age difference in human years.
Plus age of consent, true definition of "pedophile," etc. etc. This IS off-topic though.