Do you mean Matsumoto Jun?
If yes, then he's currently 26 as of August 30th this year(2008).
Jun Kondo is 81 years old (birthdate: February 6, 1930).
Jun Kaname is 36 years old (birthdate: February 21, 1981).
Jun Lana is 38 years old (birthdate: October 10, 1972).
Shi Jun is 28 years old (birthdate: October 9, 1982).
Jun Akiyama is 42 years old (birthdate: October 2, 1969).
Jun Falkenstein is 42 years old (birthdate: May 7, 1969).
Lin Jun Jie is 30 years old (birthdate: March 27, 1981).
Lee Jun Ki is 29 years old (birthdate: April 17, 1982).
Jun Ji-hyun is 29 years old (birthdate: October 30, 1981).
As of August 2011, you would be 17 years old.
Jun Matsumoto is 29 years old (birthdate: August 30, 1983).
no, Jun is... Jun... Master Chief's name is John...