Mine are 8 weeks old. I have buff laced, and white crested black. The buff laced-well one -his feathers are turning dark. I went to a show and the darker feathered ones were cockerels. Before that, I banded him because he acted like a male. He still does. And he's getting kinda messy hair right now, but not enough to say its really different.
My white crested, well at 4 weeks, my assumed male is now assumed female, and my assumed female is not assumed male. My first clue was that one acted like a female, more submissive and timid . The male is bold, and started growing red wattles and a red sortof comb. Her's are still pale and I don't see a comb.
Out of 7, 2 are really tame. But I see my other chickens get real friendly a week before they start laying, so I'll wait. I would not let them free range unless I'm outside. They are almost goofy birds, I call them airheads, and I love to watch the things they do. None are aggressive.