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Yes, they definitely can live for quite a while! I've seen them live these lifespans myself (well, I started keeping chickens just under thirteen years ago so not more than that), so I can attest that it's definitely true! Of course sometimes a bird just dies suddenly/unexpectedly when they're young, but for the most part chickens are hardy and don't seem elderly even into their advanced years. A person would have trouble picking out my two old girls from the rest of the flock, they are very vigorous, a good weight, and don't have anything wrong with them at all. They could easily make it another several years.