Under xx years of age vs. less than xx-year-old

In written English, which way is a better or correct way to say? Or any difference?

  1. Participants are less than 40-year-old.
  2. Participants are under 40 years of age.
  3. Participants are younger than 40-year-old.

Answer

“40-year-old” is often used as a noun, as in “a 40-year-old”, so the first and last are awkward. The second is correct and could also be

Participants are under 40 years old.

Attribution
Source : Link , Question Author : Christmas Boy , Answer Author : Weather Vane

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