We picked up 8 chicks(2 Barred Rocks, 2 Rhode Island Reds, 2 White Leghorns, 1 Brown Leghorn & 1 Ameraucana) at the feed store today and I forgot to ask how old they are. They have tiny little feathers on their wings and the 2 Barred Rocks have a few pin feathers on their tail. What would be a good guess of their age?