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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 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 back when I was on the right side of 40!