Retirement homes for chickens in Portland...city dwellers can keep 3 chickens. Chickens stop laying eggs after a couple of years - the urban chicken farmers can’t bear to kill their old chickens, so the chickens are put out to pasture at a couple of farms.
http://www.nytimes.com/2012/04/26/us/new-homes-beckon-for-city-chickens-in-retirement.html
My Uncle, now 95, has had chickens for as long as I can remember. And all his chickens die of old age.
He is well known for telling the story about as 12 year-old chicken he had (I’m guessing that that’s a really old for chickens) that had the legs of a young chicken. He said that they weren’t scaly, and looked like a year old chicken’s leg.
He’s been telling that story for over 30 years now :-)