I read the first few HP books to my boys at bedtime. My youngest had read all the published ones by the time he was 8, and he was fighting me for the delivery of the newly published ones by the time The Order of the Pheonix was published when he was 8 and a half.
The first few books (at least) won the Smarties Gold Award for fiction for ages 9-11.
Charley should have no problems.
(My elder son only ever read the first two, he just wasn't that interested).
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