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Years old vs. Year old

Years old

/jɪrz oʊld/

Used to indicate the age of someone or something, showing the number of years they have existed.

Examples:

She will turn eighteen years old next month.Puppies typically reach maturity at one year old.The ancient tree in the park is over 200 years old.

Synonyms:

Antonyms:

Year old

/jɪr oʊld /

Used to indicate the number of years someone or something has lived or existed

Examples:

Synonyms:

Antonyms:

This word has no antonyms

Ways to tell them apart:

Years old is used when you describe someone's age in a complete sentence.
Year old is used as an adjective to modify a noun, often before the noun it describes.
Think of years old as the complete expression for age, while year old is part of a description, like three-year-old child.

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