Two questions really: 1) I'm not really sure how old my chicks are best guess is a 1-1 1/2 weeks old. We've have them since Monday, one of them has nice wing feathers and tail feathers, the "youngest" is still getting her wing feathers. So how do you really age them? 2). How long do they need to stay under the heat? I know they should be kept about 90-95*. We keep them in our garage and the garage is 85-90*. Is that warm enough to keep them with out a lamp? We lost power for 6 hrs the other day and they seemed fine with out one. They huddle together with or with out it on while they sleep. With the light on the brooder is between 90-95 and with out it was holding between 85-90.