Just watch the eyes on them. Like I said, they will begin to get a yellow ring that gets larger and eventualy turns solid yellow. Again, the older they get, the easier.
Aubrey
watch the eye patch, a cocks will be larger and more noticable than an hens, but color is the only sure fire way to tell, on ruffed pheasants, golds and amherst, you can tell at just a few days by eye colors, the boys will be getting a gold ring around the iris on goldens, white on the amherst...