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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.
Among my books, the ones that sell best are for readers between the ages of 8 and 12. According to a study by the Association of American Publishers, the largest area of industry growth in 2014 was in the children and young adult category. 2. Children's book authors can make a living.