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Wiktionary
shonen

a. (context lang=en anime manga) Being in the style of shonen manga or anime. n. (context lang=en anime manga) A style of anime and manga for an audience of young boys.

Wikipedia
Shōnen

, shonen, or shounen, is a kango word that literally means few years and generally refers to a typical boy from elementary school through high school age. It is used in everyday conversation when referring to the period of youth, including in legal wording referencing youth, without regard to gender. Can be used as : (Name)-Shōnen.

Usage examples of "shonen".

In addition there are some ten odd publishing firms which come in at a close second, including Akita Shoten, Futabasha, Shonen Gahosha, Hakusensha, Nihon Bungeisha, and Kobunsha.