My MIL farm has 3 EE hens that are 16 years old. They occasionally still lay an egg. It goes in spurts.
My cousin still has EE hens that are 11 years old. Still laying don't know the numbers. We had spilt the batch when they were chicks. I got rid of ours to make sure I would still be getting eggs. I guess I might of been able to save some money if I would of just kept them! (Probably not since we are up to 5 kids now!)