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Rule "Missing hyphens in '5 year old'"

This is one of many errors that LanguageTool can detect.

Description: Missing hyphens in '5 year old'
Message: It seems that hyphens are missing.
Category: Punctuation (ID: PUNCTUATION)
Link: https://languagetool.org/insights/post/hyphen/#hyphenated-numbers-and-fractions-numerals
Incorrect sentences
that this rule can detect:
  • All five year olds were preparing for pre-school.
    Correction suggestion: five-year-olds
Correct sentences
for comparison:
  • It is almost 1 year old.
  • The fluid is less than 1 year old and looks and smells normal.
  • One year old at most.
ID: YEAR_OLD_HYPHEN [1]
Version: 6.6-SNAPSHOT (2024-11-24 22:33:09 +0100)