be the right side ofbe (on) the right side of 30/40 etc.
be (on) the wrong side of 30/40 etc. - to be older than 30, 40 etc..
She's not a kid anymore but she's certainly on the right side of (= younger than) 30.
(redirected from be the right side of)
be (on) the right side of (an age)
To be younger than a certain age. You can get away with dressing like a teenager when you're still on the right side of 30.I was never sore after working out when I was on the right side of 40!