Next up: twenty-something. Or thirty-something, forty-something, or a hundred-and-forty-something. As in a character is "[age in factor of ten]-something" years old.
I have to admit: when I see the phrase [number]-something my brain kind of shuts down.
Here's why (I think). It's just so unspecific. There's a huge difference between a twenty-one year old and a twenty-nine year old. I suppose twenty-"something" is supposed to be somewhere in the middle, but why not just say how old they are? "Something" is longer than every number from one to ten, so it's not as if you're saving characters.
At the same time, maybe saying "twenty-seven" is too much information and the specificity is somewhat distracting?
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