An older chicken, even though not productive in laying eggs, can still be useful, eating ticks and slugs, dominating the unruly young'uns. My girls, I think, are entitled to a retirement, because I have so benefitted from their healthy eggs! My oldest hen, Ottoline, now is about ten. I have the sweetest memories of her as a teenager, being let out of the coop and racing ahead of all the others to the compost heap, with all the excitement of a young girl let loose in the mall! So now she is sedate, but grumpy, wants the best sleep space, bread soaked in milk, and she limps rather than runs. Reminds me of myself! But that's the circle of life and why should she not have the full circle?