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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 be honest, the first time you do it, you'll probably manage it within 14 days, and the second time in around a week. However, a course claiming to show you how to write a book in 7 days flat would be disregarded by most as being crazy. IT ISN'T. This course guarantees to show you how to write a novel or screenplay in record time.