Our Americana laid her first yesterday and we have had her for 5 months, which would make her close to 9 months old. Our RIR's started laying at 7 months, and our Plymouth Rock laid her first yesterday at 9 months. Our Buffington is close and she is 9 months old. I am really not sure why all of ours are taking this long. We live in Austin Texas, they have always had laying feed, pellets, great scraps, plenty of sunlight and free ranging. They just took a long time after we got them at the first of August. I keep reading 20-25 week old chickens starting laying and keep wondering why ours took so long.