I have 3 chickens. 1 is going 4 years the other 2 are going 3. They use to lay nearly everyday until the oldest went moulting in Sept. It wasnt a total loss of feathers and she has since filled in nicely. Problem is the other 2 hens have gone on an egg strike too. I live in Hawaii and we get around 12-13 hours sunlight. I know they are getting up in age but they stopped so suddenly. I'm being patient but don't know if they'll ever lay again. It is so strange.