I can sex mine by 6 weeks but it is easier to tell if you have several of them to compare. The boys and their combs stand out from the girls. Here is a pic of two cockerels with their adoptive broody mama. They are around 8 weeks old in this pic.At what age can I expect to be able to sex accurately? I hatched 2, and oh man are they growing fast! Hoping I didn't end up with 2 boys!
In this pic you can see a pullet at around 6 weeks with a cockerel in front of her.
This chick is almost 3 weeks old and I would bet is a cockerel.