on the right side of (an age)
1 of 2phrase (1)
informal
—used with an age (such as 30, 40, 50, etc.) to say that someone is younger than that age
She's still on the right side of 40.
on the right/wrong side of (someone)
2 of 2phrase (2)
: doing things that cause someone to like or dislike one
If you get on the wrong side of him he can be very mean.
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Merriam-Webster unabridged



