I have a 5 year old black Silkie Roo who is acting lethargic, walks slowly, not steady on his feet and has lost weight. He lives in a pen with all banty girls and is still eating. I have him in the house now because it is very wet and cold outside (they are under cover out of the rain) and he was just standing in the corner sleeping standing up. Is 5 old for a Rooster? I have only had chickens for 5 years. He has always been very healthy until the last week. I have treated him for worms and mites and I have vitamins in his water. Any suggestions? Thank you.