My chicks are 14 weeks old. Chickens do not begin laying eggs until 20 weeks at the earliest. Like other animals, the chicks don't read the chicken books or get on the computer to Google such information.
I noticed a bit of 'bleaching' of the skin of two chicks around their eyes and combs. Believe it or not, coloring that normally exists in the body areas that aren't covered in feathers (Vent, Eye/Ear, Beak and Legs) fades as their egg laying begins. Once their egg laying trails off, that color returns. That is one good way to tell if your older hens need to be sent to Freezer or Crockpot Camp. Of course, if they have names and sit in your lap like mine do, they'll never be attending either of those Camps.
Just out of curiosity, I cracked open this tiny, tiny egg. There was no yolk. There was, however, the little island of white that the yolk normally would sit in. I'm thinking that those that I share the eggs with, would like them to be a bit bigger and have the amazing marigold colored yolks that we all love.
I'll get out my chicken books and begin reading to my chicks about how they aren't supposed to start laying for 6 more weeks. I think they'll be relieved.