Ignore him. He can't help himself. He never can.Don't need to sound so condescending about it. It's called google. One doesn't need to actually do science for it to be called research.

Chickens can live a long life, barring sucky genetics, bad husbandry and predators. I just haven't had them myself long enough to say from experience, only 8 years, though I was raised around my grandfather's farm and livestock.
I have had 15 or so hens die from internal laying and/or egg yolk peritonitis, starting just after they turned 2 and one by one, they dropped off; and if they lived past 4 years of age, they usually died from cancer with some signs of minor internal laying. ALL my originals came from the same hatchery, plus a couple of later ones. If you had a Red Star live that long, she was the rare exception, not the rule.
I have one hatchery hen who is 7 years old, however, she is not one of the common feed store breeds you see for egg layer flocks, she's a Brahma. Her genetics may be a tad better than say the Wyandottes (they're the worst, it seems), the Rocks, the sex links or the Orps they tend to sell more than anything else. She has not laid in almost 2 years and her crop has gone pendulous and is failing, requiring daily massage to push food through. She is the ONLY hatchery hen who ever lived that long, but she is from the second year of chicken keeping, not one of the originals.
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