I am not sure of the age of these chickens. According to what the farmer told me they are 12-14 weeks. Not sure if he really knows for sure.
The bird on the far left is male. He's got the 'rooster' red shoulders, the bright red comb, the long, thin, pointed back feathers. Now, look at your chicks. If the comb matches in color (not shape, cause you have a few different comb-types), you have a boy. If the shade of red on the shoulders/wings matches, you have a boy. If any have the same shape feathers on the back, you have a boy.
X2 on junebuggena's posts.
At this age the back feathers are the easiest to spot male/female feathering.
Here are two pullets. Look closely at the shape of their back feathers. They are broad and rounded, like the feathers over the rest of their bodies.
This photo shows a black pullet up front, and a cockerel in the back. They are about 16 weeks old in this picture. Can you see the difference in the shapes of the feathers?
This is a 16 week old pullet. Her comb is just starting to pink up, and her back feathers are broad and rounded.
Adult red rooster. Now compare his feathering to the barred hens pictured with him.
You're welcome, and I'm sorry.:o(