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You seem to be having trouble figuring out which word is the noun that needs to be the plural. Which thing do you have more of - twenty, year, or old? Twenty years is the modifier for old. You have two twenty year olds.
Wiki User
∙ 7y ago
Wiki User
∙ 7y agoThe plural form of the compound noun 'twenty year old' is
twenty year olds.
Wiki User
∙ 8y agoThe plural form of the compound noun ten-year-old is ten-year-olds.
Wiki User
∙ 8y agoOne ten year-old and two or more ten year-olds.
Wiki User
∙ 12y agofifteen-year-olds
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