Most chickens are bred to lay a lot of eggs each year. That breeding creates a perfect storm for reproductive issues from infection, internal laying, egg binding, cancers and simply draining the body of everything it has.
Like large dogs don't tend to have long lives, chickens bred for...
They can live a very long time although most do not.
I am always looking at them for anything weird or worrisome. I think it helps that the Cochin's do not lay much.
WOW, you are quite warm by comparison.
We spend several months never getting much above 32 for the highs. We also have lots of nights well below zero in winter.
We do not add heat and everyone is thriving, happy and active.
Remind yourself that even though you may be chilly the birds have...