My chicks, if they can be called that still yet, range from 7-8 weeks to 5 weeks. For the most part, they are able to access the roost and even higher, to a portion of the metal roof that covers the nesting area. I have sat in the coop and watched them and they easily jump to and from the roost. However, when it comes night time, they still prefer to huddle together in a corner and seem to have no inclination to go to the roost to sleep. These are Black Australorp, Buff Orpington, Barred Rock, Rhode Island Red, and Ameraucana. At what age should I expect them to use the roost for something besides a runway?