So in your defence... Because they say they are 18 from a fictional standpoint whilst they have the physical characteristics of a child, it is somehow ok? Canonically these characters are under the ages of 10 years old... So basically, you're using this game as an excuse to be a ped*phile?
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My point is that since these characters don't exist, any author can do anything they want with it, from aging them up physically, or just on paper. Not to mention, I have yet to see a real child that looks like this. If these were realistic depictions of children, you'd have a point, but luckily, these are straight cartoons in every way.