Talk:Nishiki Nishio/@comment-99.73.92.229-20141123071650/@comment-10733658-20141123103541

They never explicitly state, but we can assume a few things based on the information given. The series starts in October and the timeskip takes us from December to July. His birthday is in February, so he got older during that period.

He's a 2nd year, and the Japanese school year begins in April. As such, since their birth months are so close, they have to be more than a year apart in age. So rough guess is 19 - 20.

So he'd be roughly 23 in Re.