Is Year Old Hyphenated or Not?

Hyphenate “year old” if the phrase precedes a noun that it is modifying. Do you want to talk about age? Before you start, you need…

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My friend (not a native speaker either) says it should be like this. Is he correct? : r/EnglishLearning

HYPHENS English Lesson

Years-Old' or 'Years Old': Should There Be a Hyphen?