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At 16, the books our school recommended included 1984 and All Quiet on the Western Front. Crime and Punishment was part of the matriculation exam at 17. Also at 17, we were visiting Auschwitz. You ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/39956 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/39956 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
At 16, the books our school recommended included _1984_ and _All Quiet on the Western Front_. _Crime and Punishment_ was part of the matriculation exam at 17. Also at 17, we were visiting Auschwitz. You don't get more horror than that. Which is to say, you can put _any_ amount of horror in a novel for 16+ audience. By this point, teenagers are adults enough to understand it. The only issue I see is, if you go sufficiently far into a realistic description of the horrors of war, and the psychological impact of those horrors on those who experience them first hand, what you're writing is no longer a "light" novel.