The difference between -year-old and Aged
-year-old is also suffix with the meaning: suffix used to indicate the age of something or someone, in terms of years.
Aged is also noun with the meaning: old people, collectively.
Aged is also adjective with the meaning: old.
check bellow for the other definitions of -year-old and Aged
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Aged as an adjective:
Old.
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Aged as an adjective (mostly, non-US):
Having the age of.
Examples:
"Aged 18, he had no idea what to do with his life."
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Aged as an adjective:
Having undergone the improving effects of time; matured.
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Aged as a noun:
Old people, collectively.
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Aged as a verb: