well, they look older than the 6 mo. old I have. I brought these ones home about 4 weeks ago. I also have 3 roosters, if that could cause problems too?
My dh and I have 3 of those chickens-they are ISA Browns. One is layin galready and the other two still are not. They are around 17 weeks old. I have been told that you just have to be patient with them.....We get an egg pretty much every day from the one that is laying-a deep brown egg. Good Luck! This link might help you learn a little about them.... http://en.wikipedia.org/wiki/ISA_Brown