I have about 15 adult chickens and a roo. Earlier this spring I purchased 10 new chicks, they are now about 10 to 12 weeks old. I am just wondering if they are old enough or need to be older to place them with the adults chickens. The other question is what to do with the 5 little chicks my daughter purchased, they are living right now with the 10 older ones but if i take the older ones away will there be any problems with the five babies, they are only about 2 to 3 weeks old.