I searched and found some answers, but the problem is I am not sure how old my chickens are. I bought them from a farm supply store and the clerk did not know how old they were. So, I need some help. They are Barred Rocks, and they currently have feathered wings, and the tail feathers are a little over an inch long. Anybody have an idea how old they are? How much longer should I wait to put them outside? It's getting down to the upper 50's at night. Also, I don't know that I have enough cord to put a light in the coop, so there will be no heat... they will be on thier own. Any help is appreciated.