https://idioms.thefreedictionary.com...ong+side+of+30
Quote:
be (on) the wrong side of (some age) (redirected from are the wrong side of 30)
be (on) the wrong side of (some age)
To be older than a certain age.
Why is she dressing like a teenager when she is clearly the wrong side of 40?
I'm sore after every workout these days, so I'm definitely on the wrong side of 30!
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This is how I always took that saying