Well, the last week of July last year we had to put down our spunky 6-yr old Black Silkie due to a massive bleeding ovarian tumor. It was so sad to lose her because she was personality-plus except whenever she painfully had to lay an egg. She should've stopped laying eggs by age 5 like our Partridge Silkie but this little Black Silkie was a productive little girl. Unfortunately it took her life way too soon. Meanwhile, our Partridge Silkie is 7 yrs old and I heard the oldest record for a living Silkie was 17 years. Black Hen Farm seems to think a chicken's natural healthy lifespan should be 25 years. I think these are optimistic predictions because so many maladies and predators take away the lives of our beloved flocks way earlier. The genetics inherited by each individual chicken, it's environment, climate conditions, diet, disease resistance, etc etc etc all factor into a chicken's lifespan. Just because one chicken lives to 25 years doesn't mean its breed all live that long naturally. I will be happy to see if any of my girls get to 10 yrs or more, God-willing! When you think about dogs -- and sometimes cats -- that rarely live past 10 yrs, you figure you've got a pretty healthy pet if it survives past 10 yrs.