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The target audience depends on the kind of material you want to talk about. If you want to add in rape, sex, drinking, and detailed violence, you probably won't be writing a novel for 6 year olds....
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/30670 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
The target audience depends on the kind of material you want to talk about. If you want to add in rape, sex, drinking, and detailed violence, you probably won't be writing a novel for 6 year olds. I used to read a series called RedWall when I was a child, basically an personification of animals that took on a lord of the rings style of adventures. It was written without questionable details and there was no romance to it (to my memory). So really in the end, there isn't much we can do to assist in this question. This largely comes down to the material you want to talk about and how those topics are portrayed. Once you assess the material and the topics you want to discuss, you can then figure out your target audience or modify the material to be more appeasing to certain demographics.