I was reading all this thinking.. "Why hasn't someone said they are much younger than 20 weeks?"Nah. Those girls are still in lanky teenage phase. Still skinny, not filled out yet. The only one I see that is reasonably filled out and almost mature looking is the dark red ee. The age might be wrong.
b/w is a ROO because of the red feathers coming in. by the way- it is very common for mixed color breeding to throw cockerels that start out black and white and eventually get red on the wing bow and can have red showing up on back and saddles also. This one is a classic example. Enlarge the photo of him stretching out his wing.
They look to be about 12-14 weeks old to me. I agree, the two first ones are boys. I love the first boy> He is very pretty!