If I remember correctly mine starting laying about 1 week before 5 months old. She's a blue/grey one and she's an amazing layer, last month she has been laying more often than my 2 reds, only missing 1 day a week and her eggs are bigger. She was stubbornly broody for at least a month in spring, had to put some fertile appenzeller eggs under her to break it. The best forager by far of all my breeds, just crazy efficient. The roos in my experience are crazy full of testosterone though,