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It's okay to publish a book at any age. If it is a good book (or at least good enough.) Worse come to worse, if you can't publish at age 13, you can try again at age 18 or age 23. A famous writer, Pearl S. Buck published her first book at age 10, I believe.
How many books does a first novel sell, on average? I'm thinking of writing a novel for teens. Specifically, I'm targeting young males, from 12 to 25 (it's a wide range, I know). I'm wondering what sort of sales one expects from an average book. On one hand, I know there are no average books, but averages help you understand what extreme ball-park to expect. What I'd really like is a break-down of average sales fro books in various markets. For example, I've seen the number 5000 bandied about as the average sales for a first-time writer writing a business book, without using a publicist.