Chickens live around 5-10 years. The Colonel was already fully grown when Cayde-6 found him at The Farm. It's been five years since D2 launched, and if we assume that five years have also passed in-game and in the lore, then he should not be alive still.
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Edited by Breaking_08: 6/23/2022 6:09:56 PMUmm, the Colonel is a guardian so he has a longer lifespan, plus more resilience to diseases and things like that. Plus he’s awesome.