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For non-fiction, publishers basically want two things. They want you to prove that you are qualified to write the book, and they want you to have a platform -- a bunch of people who already follow ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/26676 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/26676 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
For non-fiction, publishers basically want two things. They want you to prove that you are qualified to write the book, and they want you to have a platform -- a bunch of people who already follow you or know about you would would be likely to buy the book and recommend it to others. I have never heard of a publisher rejecting an author based on age alone, and in today's youth-obsessed culture it does not seem likely. Age discrimination today is mostly directed to the old by the young, rather than the other way round. However, a young person may have more trouble demonstrating that they are qualified to write a book, simply because they may not be as qualified. There is an obvious benefit in a book about life experience to have had more life experience. On the other hand, if Taylor Swift pitches a publisher a book about life experience they are going to take it because Taylor Swift has a platform. Mere age does not qualify anybody to write about psychology or philosophy. A publisher will be looking for actual credentials -- education and/or practical work experience. But a platform trumps everything. If you can build a huge audience blogging about your ideas on psychology and philosophy, even if they are completely half baked, someone will publish your book. Basically, publishers are asking two questions (like most other businesses): Will it sell? And will it damage my brand? If they think it will sell and not damage their brand, they will sell it.