May-December (adj.)

What does the idiom “May-December (adj.)” mean?

Definition:

Significantly different in age. Said of couples where one member is much older. The most common usage is “May-December romance.”

For example:

“Bert is enjoying the benefits of a May-December romance. He married a much younger woman. Criticize him if you like, but he’s livelier than he’s been in years.”

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