This is always of high importance to me; it bugs me to no end when people use adult voice actors for child characters. Sometimes it's convincing and it works really well, but even then it irritates me just knowing it wasn't a real kid!
Except that most kids are terrible voice actors. If even grown-ups often have trouble expressing emotions while reading from a script, imagine how difficult it is for kids. Making it sound realistic necessitates not using an actual kid.
Female members would be incredibly useful; we could look into finding some from outside of TIGS. I know a community that might have a few takers to that end.
VAA definitely has female voice actors; there might be some willing to put names on the list for game related stuff.