Well, he looks like he's in his 20's, but for me i'd say eh, about 23.
Well, actually, if I understood the movie correctly, Yazoo was created at the beginning of Advent Children alongside his two brothers. That would make him merely days old by the time of his death at the end of the film. Though physically he would be in his 20s. -- ∙ ∙ 23:25, April 1, 2013 (UTC)