My daughter has just turned 3, she is currently in her settling in period to move rooms to the pre-school part of her nursery. She seems to be settling in really well and the staff are pleased with her. 
I went to collect her today and they were all outside playing, the garden they play in is well equipped, big and the kids love it! But it was chaos, I couldn't see her as there were so many children out there, what really concerned me was the older children? The nursery has an 'after school' club, so all the kids that are on school holidays can go to the nursery all day (max age 11), they were mixing with the kids from her current class (age 2 to 3) and the pre-schoolers 3+? So I asked one of the ladies in charge of the pre-school if this was normal and she said yes, the afterschoolers and pre mix together in one big room, but if there are lots of them they 'try' to keep them separate?? There were some 8-9 year olds playing with the little tikes cars etc, bumping into the little ones and generally being quite rough?
So, is this normal? Should I say something, or am I being a bit PFB!!!
Or am I right to be concerned??