old enough to be (one's) mother

old enough to be (one's) mother

Of a woman, much older than one, especially 20 or more years older (or around the age of one's actual mother). Used especially when referring to a woman who is or might be in a romantic or sexual relationship with a younger person (especially to indicate that the speaker thinks such a pairing would be inappropriate). How could you find her attractive—she's old enough to be your mother! Everyone raised their eyebrows when they met Mary's new wife, as she's old enough to be her mother. But they do seem very happy together.
See also: enough, mother, old

old enough to be someone's mother

 and old enough to be someone's father
as old as someone's parents. (Usually a way of saying that a person is too old.) You can't go out with Bill. He's old enough to be your father! He married a woman who is old enough to be his mother.
See also: enough, mother, old
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