I have multiple hens and one rooster, all hatched on the same day and now 4 1/2 years old. In the last 6 months, the roosters feathers around his beautiful ruff have changed from a vivid copper to white, as has his feathers on his head. Now I have his black Copper Maran hens showing white feathers on their heads as if they are turning gray. I just saw my 2 Gold Lace Wyandottes, who are housed separately and have no contact with the rooster's flock, are also showing a dusting of white feathers on their heads. They have been treated for mites and appear to be in good health but I don't want to miss some illness that I've never heard of. Do chickens go "gray" when they are older? I've never heard of it before. Pictures on left are of the chickens I'm referring to when they were young- they developed even more fullness and beautiful coloring as they aged. The ones on the right are what they look like now... thanks!