Hey guys. New chicken owner here. I'm wondering how/if you can tell the age of chicks by their physical looks? I bought 2 Rhode Island Red chicks about 3 weeks ago, but they were pretty big. They now almost have all their reg feathers. They have "baby fuzz" on their heads/necks, but pretty much have all their reg feathers everywhere else. Any idea how old they would be? I also went back and bought one more Rhode Island Red chick and 4 Orpington chicks. They are little and the only "normal looking" feathers they have are on the tips of their wings. Any idea how old they are? Thanks for the help.