Lacey, our oldest, is unknown but somewhere between 8 or 10 as best we can guess. The people we got her from were uncertain of her exact age. She chose to run away and live in our yard almost 4 years ago, so we became chicken parents literally overnight when her owners said we could keep her. She laid a dozen or so eggs last year spaced out with days between, then she began what appears to be perpetual molting. One section then another and another. The pin feathers on her bottom never seem to fully open. I've wondered if this is due to age. She didn't do this before last Summer. We are waiting to see if she lays any eggs this year. She needs the full hours of sunlight to lay. Has never laid in the Winter. We don't use a light in the coop. Our other chicken, Cagney, is 4 and still pretty much an egg machine. Misses a day here and there.