"Gay" isn't the same as "pedophile," and I'm sure you didn't intend to imply it. For that matter, given Dumbledore's personality, he comes off as largely asexual regardless of his orientation. Not much "creepy" there at all.

Come to that, most famous fictional wizards seem to be that way. Gandalf, for one (ironically played by a gay actor in the movies). The Unseen University in the Pratchett books seems to be full of wizards who don't get out much, but at least you get the idea they wish they could.

Maybe they all read the legend of Merlin and Nimue, and figured girls were probably bad news all around.