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Write your book now, and don't worry about selling it until after it's finished. By the time you finish it, you will be older anyway. And even if you never publish it, it will still be good pract...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/29768 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Write your book now, and don't worry about selling it until after it's finished. By the time you finish it, you will be older anyway. And even if you never publish it, it will still be good practice. There's always a good reason not to write any given book at any given time, so sometimes you just have to jump in and write anyway. If it still seems like a good book idea to you in a few years, you can always rewrite it then. But even if you've moved on from the idea, you'll have learned some valuable things from the process of writing it.