Does 20-30 year olds look right, or does it look like a bunch of 1 year olds with a quantity of 20 to 30 of them?
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GPYOne solution may be to write "The disease affects 20- to 30-year-old males".yes
GPYThough in reality you may mean something more like this: "The disease mainly affects young men in their twenties and thirties".omit "young"