In the lovely baby-house we were at they stay until aged 4 then they move to a 4-7yr old place which I gather is also not too bad then 7-16yrs which I gather is a nightmare for the littler ones and few of them leave at 16 with anywhere to go except prison or the streets.
I think what bothered me most about the older children is that they have nothing of their own. Nothing, not their clothes, toys, nothing, its all shared. I can't imagine how that feels. Imagine how your DC's feel about their favorite toys, what a fuss they can kick up about what to wear.