It's been a particularly brutal summer in the north east. Most of the chickens that I know are seriously messed up this year. 22 weeks is NOT old. Give the girls a chance. Another couple of weeks, I'm betting RICH rewards will follow. (I have 12 that are 21 weeks old. Same boat. My 11 hens are either moulting or on strike for mysterious reasons. Out of 23 birds, I'm getting about 4 eggs a day ... )