I think Charlie was around 20 months, but we kept him in his crib for another 6 months because he was in his sleep sack. Then he was able to climb out with the sleep sack so we transitioned him to a normal bed.
Olive will be 2 soon, and she's so cautious I doubt she will try to climb out of her crib.... ever? At least not until she's 3! So she will probably be in her crib for a while (though it does transition into a toddler bed).
When did your LO first climb out?