We use the singular (usually hyphenated) for ages expressed as adjectives before a noun or as substitutes for a noun. We use the plural without hyphens when we are simply stating the age of something / someone. John is 16.
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We use the singular (usually hyphenated) for ages expressed as adjectives before a noun or as substitutes for a noun.
We use the plural without hyphens when we are simply stating the age of something / someone.