Which two?3-4 months, most likely.
I see one or two in that group you could grab that I'd be 70% sure was female. But there's no way to know right now, really.
But these are mutts.The picture of them younger can help. In person (on my silkies) I can tell by the placement of the crest. At their current age I would expect cockeral tails to sit a bit higher than pullets. The body size may also be larger for cockerals. Comb appearance can help as well ,as some hens never develop much of a comb at all. I always have a hard time judging in a pic, but I would guess the first light colored one pictured male and the naked neck male. The other 2 are possibly pullets.