I have some ancient chickens, probably 13+ years old now, that I raised from chicks. I had one little Japanese bantam who's eyes just started closing, and he finally just gave up on keeping them open. I could give him water, but couldn't make him eat. I just figured it was his time. Now, I have a golden Seabright that is doing the same thing. This is not showing up in any of the other old birds, or the young laying hens. At least not yet. Any ideas?