I think he's too young too. I'm waiting for his comb to get redder or some other sign off being a rooster but nothing yet so I'm hopeful. My polish and silkies are the same age and some of them are already displaying some rooster traits. I wish I had more sultans with him to compare lol. Either way I'm in love with this breed now
Try putting him with some for sure hens, because if he's a male he may try to breed.