Can't remember the novels ever specifying beyond "mid-teens," the Super Guide only lists ages for the Casull siblings (as well as birth dates, blood types, heights, weights, hobbies, and likes . . . actually maybe I'll post those just for the hell of it [on the other hand, the temptation will be to include everything in their respective six-page profiles, which will result in further delays to the novel translations], BUT I DIGRESS), and apparently the anime guide is . . . packed. Aha.

I always assumed he was fourteen or fifteen, though.