DarkFather said:
Goku being childlike and happy-go-lucky DOES NOT mean he has to LITERALLY have THE voice of A CHILD.

No, it doesn't mean he has to, but it still fits the character. I guess next you're gonna tell me that Kuririn being voiced by a female is totally out of the realm of believability too?

Part of the logic of this is that the characters started out as children being voice by females and were seen that way by audiences for a few years before they grew into adults. Therefore, the Japanese version was more concerned with a performance continuity rather than literal logistic continuity. That's also why you have the same adult male voice actor portraying both the adult and child versions of Trunks. The only time I think this doesn't work in the Japanese version is when Ryo Horikawa plays the young Vegeta. But I forgive it because it's so brief, and because it also doesn't work in the English version since Chris Sabat sucks as Vegeta at any age.

EDIT: You know, I really do enjoy debating DB with you (I haven't gotten into a good dub vs. original argument since high school!), and this is the second thread this has popped up in. We have a DB thread in the off-topic section that hasn't been getting much love lately. I'd be more than happy to take these debates of ours over there, but I suppose I have to concede it doesn't belong here... especially in this thread where I'm kinda busy pummeling respect into C3PX. ^_~