I have two chickens laying nearly daily, I also have one that is a Light Brahma, she doesn't seem close to laying, they are all about 22 weeks old. I have three at 15 weeks, 2 Barred Rocks and one EE. A few days ago, I found a very pale and thin shelled egg broken in one of the nests. I also found later in the day, two regular eggs, from my older girls. Doing the egg laying math, obviously there is a third one starting to lay. This morning, I found two very pale, very thin shelled eggs on the floor of the coop. This must mean that the 15 week old BR's are laying. Is that typical of very early age laying? I have calcium through oyster shells and they are eating it. Do you think the light shells and the thinness is a typical part of laying at such an early age?