When to move to a bigger cage

[Jewel]

At what age or size would I move my panthers out of their glass aquariums to their new cage? We have a 4x2x2 for the male already build but we are not sure what size we will be building for the female.

 

[ChromaChameleons]

In my experience , age and size are less of a deciding factor than ability to catch food. Try your cham in a large enclosure and observe if it can find its food. If it can, then it is ready for a large enclosure. Don't forget to provide plenty of foliage.