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The thirty-five-year-old patient

Is that correct?

Or one of

The thirty five-year old patient
The thirty-five-year old patient
The thirty-five year-old patient
The thirty five year old patient

etc.

What's the correct way to hyphenate phrases like this?

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Numbers such as thirty-five are hyphenated.

When used attributively or as a noun, x-year-old is hyphenated.

Therefore, a thirty-five-year-old patient is thus hyphenated, but

The patient was thirty-five years old.

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  • The over-prescriptive answer at the duplicate at least added supporting evidence from CMoS. I'll be back. Jan 26 '18 at 9:45
  • The answer by @KarlG is correct. I would add a contrasting example with 'x-year-old' being used as a noun, e.g. "The patient was a thirty-five-year-old. Jan 26 '18 at 9:49
  • 2
    Ultimately what is "correct" and what isn't could vary by style guide, where you live, personal choice etc. All I can say is that, as one who has completed a humanities degree at a British university within the last ten years, your choice would be my own personal preference.
    – WS2
    Jan 26 '18 at 9:59

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