My chickens are almost 25 weeks old. I have 1 that started laying about a week ago and she's been laying an egg every day, but none of the rest of our flock are laying yet. We put a light out in our coop. They have free run of our yard during the day and come in at dark. We have searched and searched he yard to make sure we aren't missing any, but haven't seen any other chickens laying yet.