[01.21.2024] Spelling/Grammar, AnKing Overhaul for Step 1 & 2/AnKingMed, ID 1006166

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whats the difference between using 15-years-old and 15 years old? like when do you use which? (just curious haha)

“15-year-old” is the adjective form; “15-years-old” is not used as an adjective. You could also say someone is 15 years old.

Normally you use hyphens for compound adjectives. 15 years old isn’t a compound adjective, but 15-year-old is one