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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When Should Ages Be Hyphenated? The Years-Old Question, 55% OFF

12 year old girl, 12-year-old-girl, or 12-year-old girl? How should I hyphenate?

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