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18 Years Old or 18-Years-Old? When to Hyphenate Years Old
Years Old: Hyphen or No Hyphen? | Grammar Party
Is "Year Old" Hyphenated or Not? | Grammarly
Year Old Or Years Old? - English Language Learners Stack Exchange
Year Old or Years Old - Which Is Correct? (+Hyphen Rule)
Year Old or Years Old? - Espresso English
How to Hyphenate an Age - GRAMMARIST
‘Year Old’ or ‘Years Old’: What’s the Difference Between the Two?
"Years-Old" or "Years Old" - Should There Be a Hyphen?
Age - English Grammar Today - Cambridge Dictionary