I have one large flock divided into several subflocks:
The Hens (4) 2-years
The Biddies (3) 6-months
Lil 'n' Lu (2) 6-months
The Chickies (4) ten-weeks
And, if Jen's eggs hatch, the Buggers (one-week-in-the-egg)
They all free range together.
I have two coops: the main one divided into several apartments, to accommodate most of the subflocks, and a smaller one for the last subflock.
The Hens and Lil 'n' Lu both have a rooster in their pen. They take turns free ranging because they'll fight otherwise.