I have seven pullets (must learn to stop saying chicks ). The Mille Fleur D'Uccles are the oldest, at 16 weeks next Wednesday. The Americana and Wyandotte are almost 13 weeks, and the Polish and Partridge 12. I know that 16 weeks is the *magic* age to switch to layer feed, but who rules in a mixed-age flock? (We feed Nutrena NatureWise Starter Grower to them now, and still have an unopened 25 lb. bag, plus most of a 5-gallon pickle bucket full of this crumble). Are the older ones okay staying on the "baby food"another month? Is there harm in putting the youngest on layer feed a month early? We got the older ones on Chick Day, knowing that they'll grow to be smaller than the just-hatched ones, who will protect them from the "big girls" when they all come together later. They are mostly segregated in their own run, and we have chicken wire splitting the coop, so they don't get near the older hens, or their layer feed. It's just a little confusing at this in-between stage.