Correction to the previous correction: The original article states, "I met Harry when he was 13 and I was 15. The third book had been released a few months earlier, and Lindsey, my best friend, had pressed the first one on me, saying I would love it." The way I read this, the author was saying that the fictional Harry was 13 when the third book was released (when she, the author, was 15). This does not conflict with the fact, as you stated, that Harry was 11 in the first book.