For ages, always use figures. If the age is used as an adjective or as a substitute for a noun, then it should be hyphenated. Don’t use apostrophes when describing an age range. Also, when the number is less than ten, it should be spelled out.
Examples: A 21-year-old student. The student is 21 years old. She is six. A six-year-old girl.
Zean Liao
Writer, Three Penny Press
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