Hens DEFINETLY, if roosters, they would have sickle shaped saddle and tail feathers.(and a noticeably longer tail and larger combs and wattles) A rooster would probably be crowing a good bit by that age.
They look alot like Brahmas. to me. They're most likely the same breed, just different plumage types. I assume Brahma because of the darker feathers on the hackle and tail of the light one, and also the feathering on the legs. If they are bantam Brahmas, they will still be close to the size of a...
The feather coloring looks a lot like our Brown Leghorns, Leghorns also have a bit bigger tail than usual for a hen. The yellow shanks are also a characteristic in Leghorns. If they are Leghorns, they will start to develop a larger comb that will lay to one side(in hens).
I agree that they are Delawares because of the mainly white feathers on the body, and black feathers at the hackle and tail, and also the yellow shanks; hard to tell for sure about gender because of the mainly lighter plumage.