Ideally, characters are voiced by people that have the same "adult or minor?" and "male or female?" answers that the character himself/herself would have.
But it's not always possible to get what's ideal here. And I'm not sure if adult males would be preferable to adult females when voicing male kids. I'm inclined to think that the problem would just go to the opposite end, and possibly to a more severe degree - The voice would likely sound overly deep, mature, and/or gruff.
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