Mine are together, however my situation was somewhat unique in that we were moving and I had to build a brand new coop. I had had my layers at my old house for years but when we found out we were moving to some acreage, and knowing I could increase my flock, I went ahead and got some keets and ducklings, along with some spring chicks, and had them in brooders scattered around the old house, while we prepared to move and built the new coop. Yep, a little chaotic for awhile
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So skip forward to the coop being finished and ready to move birds to, and I first moved the spring chicks because the roosters among them were crowing. A week later I moved the guineas and ducklings. Being younger than the spring chicks, there was seemingly no problem with adding them to the coop. I kept them all locked up for a week while I finished the fencing for the chicken yard. THEN I moved the layers to the new coop. Under ordinary circumstances, the layers might have reacted negatively to precocious youngsters being added to "their" coop but because I moved them last, they were the newcomers coming into territory already owned by said youngsters, so there was no issue whatsoever. I kept them all in the coop for about 36 hours but then a heat wave started and I had to let them out. 36 hours turned out to be enough for the layers and of course the younger birds had already been there a long enough time to imprint. So at the end of the day, everyone returned to the coop to the roost and that's how it has been for the last two weeks.
The only issue we have is a bit of squabbling at bed time - nothing too bad. Its just that the layers feel the highest roost is rightfully theirs because they are the oldest, while the guineas (now 7-8 weeks old), feel the highest roost is rightfully theirs because, well, because they are guineas. So if you stand outside the coop at bedtime you'll hear birds telling each other off and occasionally even pushing one another off the roosts but eventually all quietens down and there they will be all asleep.
