16-17 years old.
Daisuke Ono does his voice in the Japanese version.
Haruhi Suzumiya , Kyon , Yuki Nagato , Mikura Asahina and Itsuki Koizumi .
Haruhi Suzumiya Kyon Itsuki Koizumi Kunikida Yuki Nagato Taniguchi Ryoko Asakura Kyon's Sister Tsuruya-san Mikuru Asahina
Yes he does. While it's not really made obvious in the anime or manga, it was confirmed by the creator that they were in a homosexual relationship.
Itsuki Yamazaki was born in Japan.
Itsuki Toyama was born in 1976.
Hiroshi Itsuki was born on 1948-03-14.
Natsumi Itsuki was born on 1960-02-05.
Itsuki Shoda was born on 1981-11-03.
Kazuhiro Koizumi was born in 1949.
Koizumi Junsaku was born in 1924.