So far, the book industry seems to have loosely rated books for younger kids already, according to subject material and so forth. Anything more than that, IMHO, would be overkill, and honestly impossible to ever complete. There are way, way, way too many books in existence for any kind of rating agency to go through. And there is the fact that the books won't all be in the same language, something that can't be gotten around with subtitles or just eyeballing the content.
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