I've had the most fun playing youths--annoying, idealistic, and a little bit naive. They have to be old enough that it isn't completely silly to see them wearing adult-sized clothes and swinging a sword. And then young enough to limit the dirty old men hitting on them.
I also like to have a character grow up in game , shaped by what happens to become a mature adult personality. I prefer that to starting as an adult with a backstory.
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