The meaning is changing (warning: history)

Wiktionary defines paedophilia as:

1. sexual feelings of adults directed towards children.
2. Overt sexual acts directed toward children.
( http://en.wiktionary.org/wiki/paedophilia )

And this is just based on common usage. I want to say that there is no historical basis for this, but then there's also no historical basis for the use of paedo when referring to girls (the Greek root is specifically malealthough when I was trying to find just what that root is, wiktionary is telling me that παῖς is gender neutral, so I'm not sure), and in fact the root from which we get philia (φιλία) means something more like friendship (but I'll admit that my Ancient Greek is not strong enough to understand the nuances of all those words for love, and in fact I don't even speak Ancient Greek at all).

More importantly though, I believe, is the medical definition. Which has also been butchered beyond repair.

When paraphiliae were first listed in the DSM (the standard book for diagnosing mental diseases in North America) there wasn't much definition to them. However, realizing that not all fetishes were mental illnesses, the definition was narrowed. The paraphilia must be consistent over a six month period and it must also be causing clinically significant amounts of stress. Oh, and homosexuality is no longer a paraphilia because of social pressure. BUT BUT, there was one exception to this diagnosis. Paedophilia or paraphilia involving nonconsenting persons (I believe the DSM says "and other nonconsenting persons") can be diagnosed based solely on carrying out an action. That is, you don't even need to be a paedophile (a person attracted to a child) to be clinically diagnosed as a paedophile, under the DSM.

To top all this off, some people wish to include hebephilia and ephebophilia as paraphiliae in the next edition of the DSM (DSM-V).