Hm...how old did your fellow high school students sound during your time? I think Nayuki is one of the more mature girls in the anime, so it fits. But I still don't think that Nayuki and Ayu sound too old for their ages.
Anyway, the dub looks good so far. The only one that sounded awkward to me was Yuuichi. Maybe because Tomokazu Sugita sounded so much older and...manlier? lol
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