I have 4 mixed layers they are little over a year now. I just got 3 egg laying pullets about 2-3 weeks old now. I have them inside my basement right now because of the cold temps in MI still. Can I put with my older chickens and when is a good age to do that??? I can put a heat light outside for them when the time comes. I'm kinda new at this still and any advise would be helpful.