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  1. 18 Years Old or 18-Years-Old? When to Hyphenate Years Old

  2. Years Old: Hyphen or No Hyphen? | Grammar Party

  3. Is "Year Old" Hyphenated or Not? | Grammarly

  4. Year Old Or Years Old? - English Language Learners Stack Exchange

  5. Year Old or Years Old - Which Is Correct? (+Hyphen Rule)

  6. Year Old or Years Old? - Espresso English

  7. How to Hyphenate an Age - GRAMMARIST

  8. Year Old’ or ‘Years Old’: What’s the Difference Between the Two?

  9. "Years-Old" or "Years Old" - Should There Be a Hyphen?

  10. Age - English Grammar Today - Cambridge Dictionary