My 2 English Buff Os will turn 7 months tomorrow. Monty, the K is huge too. It floors people when I tell them how old he is. His mate, Mrs. Pumphry, produced 3 chicks last week, and more are hatching today.One early bird out already. I love watching them grow.People have been selling these young. They fill out when they are older. All of mine are now to filling out fast. They still have a long way to go. I have heard that it takes 18 months for them to fill out completely.