User blog comment:Genda Koujirou/Summaries for upcoming episodes/@comment-3153924-20110608105836/@comment-4862917-20110611051559

I doubt the 21 year old thing. If time is dimensional in the series, and they really ARE junior high (chuugakkou) students, they must've graduated at around 15-16 years old.

Unless Level-5 is an arse at some point and completely screwed up Japan's education. xDDDD But I doubt that. xDDD