You know what it looks like… but what is it called?
TAKE THE QUIZ“anage”
The following 2 entries include the term anage.
on the right side of (an age)
idiom—used with an age (such as 30, 40, 50, etc.) to say that someone is younger than that age
on the wrong side of (an age)
idiom—used with an age (such as 30, 40, 50, etc.) to say that someone is older than that age
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Merriam-Webster unabridged