I have a 21 week old Buff Orphington who started laying three days ago. She has produced one adorable little egg each day, the first one a night drop into the poop hammock, the second and third in the nest box. When I took the second egg from the nest box, she fussed and followed me around, and then kept going back in like she was looking for it. This morning, she was sitting in the nest box with an egg and she spent about two hours in there on it before I finally went in and took it. She stayed in the box and every time I take her out, she goes right back in. One of my New Hampshire Reds laid her first egg yesterday, and she seemed like she couldn't get out of the nest box fast enough to sing about her accomplishment. I know Buff Orphingtons incline toward broodiness, but it never occurred to me that it might start right from the start (if that's even what she is experimenting with). Is that usual? Is she just figuring out this whole egg laying, and what to do next, business? And it also occurred to me that with most mammals there is a age range when reproduction is best undertaken -- is there a similar range for chickens, can they be too young or too old for chicks (in terms both of viability of chicks and health of hen)?