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Kirito was a 2nd year middle school student upon entering SAO, I believe. Despite his youthfulness however most characters are clueless about his age: while he looks young, he acts very mature for his age. He doesn't really have the perverted side most of the males in SAO have and his interpersonal skills are "supposedly" extremely poor (his own words), yet he somehow knows how to say the right things at the right time..
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