I have never combined ages when I raised chicks... except for maybe a week or two apart from each other. We have 2-3 coops that we rotate out according to the hens' ages, basically. My leftover older flock have mostly gone rogue... My barred rock moved out when her buddy passed on and now lives with my guineas (how she can stand them I don't know)... my 2 mystery black hens have moved in with the goats (?) but my one sweet orpington is left in the coop all by herself. So... I want to raise my newbies in that coop... it simplifies it SOOO much when I can just keep them in there once they're old enough to move out of the house... But what are the chances of letting my poor Orpington stay in there with them? She's pretty sweet and docile. What's the advice from people who've done this? Is it mostly just try and observe to see how they do? Or is it more predictable than that? I have never combined ages until the chicks were probably at least 3 -4 months or so... thanks!