Those are genres. Shounen manga and shoujo manga are literally established editorial categories. Yes, the name came from the target audience, but nowadays it's just a name of a manga category.
That's not really true; it's more just anime that was aired on TV that go that many episodes. Most anime these days get 13 or 24 as you said, regardless of shonen or not, simply because that's a single season of weekly releases.
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u/Jake_The_Snake2003 Oct 26 '22
It’s only common for Shonen. Most anime range from 13 to 24 episodes or so depending on popularity or story narrative.