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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.
1 TIP 1: If you want to write a book, you must first expect it of yourself. 2  Tip 2: If you want to write a book, get clear on your intent. 3  Tip 3: If you want to write a book, make room for the universe to assist you.  Writing A Best-Selling Book.