BTW, another common example of a woman voicing a young male voice is Bart Simpson in The Simpsons... show's been running for what? 20 years now? A male voice actor definately wouldn't sound like a preteen boy by now.
Young male leads are often voiced by women, since older males sound too deep for a young male, and young male voices tend to deepen with age, a bad thing in a long running series where the character doesn't age.
Was pretty obvious it was a woman who voiced Naruto in both the Japanese and US version. What surprised me is that she is the voice of Lambo in Hotman Reborn, I kew the voice sounded familiar but it's not as obvious as most others.