I didn't pick an age since I think what books a child/teen/adult reads is based on how well they can read and what subject matters interest them. My daughter and her friends have counted the days the next Harry Potter books were coming out... being much more excite about them than the movie versions.
The series may very well have gotten more violent and 'adult' in nature due to the characters getting older. I've never read any of the books and have only seen the first movie.
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