Mikuru may be about one year older than Kyon and Haruhi. It was stated in both the novel and the anime that she is a second-year student, and is thus Kyon's 'senpai'. However... since she is a time-traveller, this screws up everything. How old is she, really?
Yuki is three years old... and she has assimilated herself into Kyon's age group( first years).
Itsuki is... eh... a first year too, but I doubt it is his ACTUAL age, since he is working undercover for his agency. I suspect he is actually older.
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