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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.
To get a high quality self-published book, you should pay for general editing, structural editing, line editing, cover design, a barcode, and ISBN number, proof copies â all out of your own pocket. A professionally done self-published book can cost you $5,000 to $10,000. A moderately well-done self-published book can run from $800 â $2,000. A very poorly done self-published book will cost $150 â $500. Itâs hard to go any cheaper than that.