Mine rooster is around 10 months (ish?). I heard him crow once, but it was a long time ago when he wad the only rooster and it was a sad little crow. He still isn't full feathered out, and has never mated (to my knowledge.) For some reason my trio refuses to socialize with any of the other chickens. Even when they sleep they dont roost they huddle together in a pile. The only thing they like is my cat, who I've found sleeping with his head on their fluffy butts so many times.
I have two Jubillee hens and they are the same way! They refuse to socialize with the rest of my flock. They are always together and always want to be left alone. They also won't roost with the rest of my girls. They sleep squished together in a nesting box.