First one (first five pictures) is about 5 months old and is the largest by far of all its siblings. Until recently it was 100% black, including the comb. Very leggy.
The second (pictures 6-10) is about two weeks younger.
All my chicks have a lot of room to move outdoors so they’re all on the small side except that first one.
NONE of my chicks have obvious rooster feathering yet as far as I can tell, none have spur buds (or they all do), none have crowed, and I have about 45 chicks from hatching my own eggs from my own chickens, so them all being the same sex would be kind of miraculous.