"Christopher Paolini was only 15 when he began writing Eragon, the best-selling book that would change his life. The book was published when he was 19, causing book reviewers to enthusiastically call him a whiz kid and teenage sensation. Mr Paolini's young age, however, is never once betrayed in his writing. In fact, the book seems mature beyond his age."
My full review of Eldest is here.