Many of the tagahanga letters I receive ask the tanong “How old are Inuyasha and the other characters?” Some fans make guesses. The character with the greatest range is Miroku, with guesses ranging from the late teens to late twenties… I basically think it's all right for the readers to view the characters as whatever age they see fit, but since so many people ask this, I'll answer with the ages I have in my head as I work.

It is clearly stated that Kagome's age is 15, so for balance, Sango is about 15 or 16, and Miroku about 17, 18. I think of Kikyo as having died at about age 17… Demons...