I would think that set up would work. The oldest roosters in my bachelor pen are 3 years old and the youngest (the ones I ostracized tonight) are 4 months old. Once they settle in, they all get along or learn to stay out of one another's way. Many of the older birds sit on the roost and I catch them looking down at the younger boys squabbling with one another and I can imagine by the looks on their faces that they are thinking 'Idiots'.