I know that when I write, I'm writing for people who can handle high-school math, read at the Grade 12 level, and appreciate subtle humor as opposed to the toilet-bowl kind. I guess that makes the lower cutoff about 17-18 years old.

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Notes from Wikiquote

Answer to the question about which age group GURPS is aimed at

Attribution

Quote text and notes from Wikiquote: Sean Punch (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.