Until what age did you put your baby in a crib/ playpen (whether to sleep or to play)?

My friends usually transit their babies from crib to bed at around 1 year old. The earliest was a 17-month old baby, and there are still a couple who have past 2 but still sleeping in their cribs. My friends usually look out for signs to indicate that they babies are ready for the change. One common sign is that the child kept trying to climb out of the crib. This made my mummy friends nervous since a lot are very active and it’s dangerous if their children managed to climb out. Another one decided to change after her baby mastered going to the toilet by himself.