My Thor, a dark brahma, continued to grow and put on weight until he was nearly two years old. He weighed 13 lbs. in his prime. A LF brahma is not considered full grown until they reach two. DH and I were outside watching "chicken TV" yesterday evening and both noted how big my brahma hens are now. They are 3 1/2 years old, just finishing up a molt, and are absolutely huge. The largest hen weighs 9 lbs.