I bought these two barred rock chicks about two weeks ago and they looked to be about 2 weeks or so at the time. The chick in the front has always been a little bigger so I'm guessing it is older than the other one in the back (the small chick is a cochin). They both look pretty dark to me, the one up front has dark leg wash and a small tail coming in. The one in the back has a bigger tail and not sure on the leg wash. Anyone know or want to make a guess pullets or roos or one of each? I will try to get better pictures tomorrow, my guess is the one up front a pullet and not sure on the one in the back. Do barred rock hens or roosters develop a tail first?? Thanks!