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I like their advice (eschew the hyphens): What’s an editor to do? The recommend standard is to use the hyphens in the noun form: 24-year-olds. But if you forget or you just don’t like the look of it, you can get away with the completely open form: 24 year olds.

— Grammarholic

  • I like their advice (eschew the hyphens): What’s an editor to do?
  • The recommend standard is to use the hyphens in the noun form: 24-year-olds.
  • But if you forget or you just don’t like the look of it, you can get away with the completely open form: 24 year olds.
  • Just don’t compromise and put only one hyphen in.
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3 Answers
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I like their advice (eschew the hyphens):

What’s an editor to do?

The recommend standard is to use the hyphens in the noun form: 24-year-olds. But if you forget or you just don’t like the look of it, you can get away with the completely open form: 24 year olds.

Just don’t compromise and put only one hyphen in.
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I just noticed they should have used 'recommended'.
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The results from Google "ngrams" are completely different from their COCA search:

https://books.google.com/ngrams/graph?content=year-olds%2C+year+ol
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