I have some 4 week olds and yours have more feathers than mine. At least 4 weeks maybe even 6 weeks old. Mine, too, are eating like crazy!!! I agree the BR are boys. Look at their faces and if you see wattles then they are boys. Look for a orangish/redish/pinkish color on the comb and my boy's combs are twice the size of my girls. The combs stand taller.