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Tolkein's books, if he hasn't read them already.

The "Earthsea" trilogy by Ursula K. LeGuin (I think the original trilogy is brilliant-- her later additions to it...not so much)

Anne McCaffrey's "Pern" books (her two original trilogies, the "Dragonriders" and "Harper Hall" trilogies, are excellent. The quality of the stories drops sharply as she goes on afterward to milk the concept dry)

The "Time" quintet by Madeleine L'Engle

The "Prydain" books by Lloyd Alexander

The "Riddle-Master" trilogy by Patricia McKillip

The "Ender" series by Orson Scott Card

14 is also a good time to start on some classics. So I'd recommend good translations of works by Alexandre Dumas (The Three Musketeers, The Count of Monte Cristo, etc.) and Victor Hugo, some Dickens, some H.G. Welles, the works of Poe and Twain, the Sherlock Holmes canon, the mysteries of Raymond Chandler and Dashiell Hammett, The Prisoner of Zenda, Frankenstein, Dracula, Brave New World, 1984 and The Catcher in the Rye.

BTW, when it comes to the classics, I am a big believer in never, ever getting abridged books-- even long books should be read in the original, unabridged form. For unabridgement and also for translation quality (when applicable), I recommend the Penguin Classics editions, when possible.

__________________
Dull sublunary lovers love,
Whose soul is sense, cannot admit
Absence, because it doth remove
That thing which elemented it.

(From "A Valediction: Forbidding Mourning" by John Donne)