I have one roo, a 6 month old silkie. The other chickens I think are all hens. He hasn't started crowing but he is definitely a rooster. Big, long streamers coming out of his crest and he struts around. He also has a pretty big tail coming in. The thing is, he has a single comb and so does my hen. Don't silkies have walnut combs? And when will he start crowing? I am knew to silkies.
I've had Silkies for four years, and they vary greatly. They should have walnut combs, unless they are mixed or just poor quality...they're still great birds though! I had one Silkie boy crow at two weeks old. Another didn't start til eleven months. The average time I have them start is seven months.