I just recently found out that my white silkie was a roo. I forget how old he was exactly. I bought him straight run. Thankfully the person I buy from has a policy where if the chick turns out to be a roo you can come back and trade. But yea, it was glaringly obvious that my silkie was a roo, big red comb and nice, prominant, red wattles. Thankfully he wasn't much of a crower, but he did like to growl lol