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oh dark thirty
In military time, a non-specific time in the early morning, before the sun rises. Why on earth are we meeting at oh dark thirty? That's too early to do anything besides sleep!
be (on) the wrong side of (an 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!
be (on) the wrong side of 30/40 etc.
to be older than 30, 40 etc. I don't know his exact age but I should say he's the wrong side of fifty.