Definition of be old enough to be someone's father or mother in English:

be old enough to be someone's father (or mother)

informal Be much older than someone (used to suggest that a romantic or sexual relationship between the people concerned is inappropriate): he was furious with her for wasting herself on a man old enough to be her father
More example sentences
  • Cat calmly turned around and looked at the trucker, he was old enough to be her father and big enough to crush her with one fist.
  • It was another of John's meaningless sexual encounters, and this one with a woman old enough to be his mother.
  • You're darling, but you should be chatting up other 21-year-olds instead of someone who's old enough to be your mother.
See parent entry: old

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