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Year Old Or Years Old? - English Language Learners Stack Exchange
word difference - What is Correct? Year old or years old? - English ...
"Year olds" or "year-olds" - English Language & Usage Stack …
Difference between "two years old and two-year-old"
grammatical number - "a ten years old boy" or "a ten year old boy ...
Is it formal or informal to use y/o as an abbreviation of "years old"?
Describing a group of children - year or years, old or olds
singular vs plural - 0 year old or 0 years old - English Language ...
"40-50 years old" vs. "40-50 year olds" when referring to a group
phrase usage - What is the logic behind "I am X years old"?