Currently we have 4 four year old hens; one BR, one EE and 2 silkies. We picked up 4 additional chicks (one EE, one Buff Brahma and 2 Buff Cochins) that are currently living in our back bathroom, happy and content. We have been letting everyone meet one another daily when we let the big girls out to free range in the yard and carefully watch them with the newbees. So my question is, at what age do we slowly add them to the coop? We are planning on adding a separate temporary space until everyone really gets to know each other. But at what age?