Looking at rooster longevity; in 'natural' flocks, the old guy gets supplanted by a young upstart, as the older bird looses strength and stamina, for whatever reason. Or he dies by predation. It pays to be both smart and lucky!
Mary
Every aspect mentioned plays a role in longevity, and when looking at just three of the factors, it's easy to see where issues could originate;
Historical selection based on predation, not just in the USA, but back in SE Asia and their jungle fowl ancestors. How many individuals actually...
Welcome!
Some breeds do tend to live longer than others, but it's an individual issue too.
Very few breeders select for longevity, rather breeding one year old birds every year, because it's the most economical method.
Some of the game type birds, and some like Sumatras and Cubalayas, do live...