Hen or rooster?

[Sandstorm]

I have been keeping an eye on these 3 as possible roosters. They are about 7-8 weeks old now. 1st is a blue laced red wyondotte (the comb is slightly red at the top) 2nd is a golden phoenix (the chest has some black in it which makes me think rooster) and 3rd is an olive egger. I was told its a black copper Maran x ameraucana. These chicks are from our local tractor supply company. I've posted the olive egger on another thread about a week ago and was told that black copper marans have large combs so it could possibly be a female and to keep an eye on him/her. Please let me know what you think. Thanks!

 

[Crazy for Chickens!]

Pullet
Pullet
Cockerel

 

[Sandstorm]

At what age can you tell if a golden laced crested polish is a pullet or cockerel? I have a 5 week old golden laced polish.

 

[Sandstorm]

Here is a picture of the polish. Is it too early to tell?