'Kay so I can't remember if it was in an episode of the ऐनीमे या not, and I don't have any Mangas so does anybody know the Kishin Asura's age?

On the wiki, it say that "Around 800 years before the events of Soul Eater , Lord Death, to improve himself, created Asura द्वारा taking out the fear in his soul. " Therefore, I guess he is a little और than 800 years old.

IT'S OVER 9000!!!!!!!!!!!!!!!!

Sorry, I'm afraid I don't know.