Mine started laying right around 21 weeks, but I think it just depends on the birds. Right before they started to lay, I noticed their combs became really bright red and my first layer started making all sorts of noises that she didn't do before. A couple days after that, she started to lay, and a week after that, my other one started laying. I think some EE just take longer to mature depending on what they are mixed with, too, but that is just my thoughts. Good luck!