I would not bet on a chicken living 10 years. I have NEVER even come close. IMHO a 4 year old chicken is an old hen. I have dealt mostly with hatchery birds, and it is not uncommon in my experience to have several flock mates, hatched the same year to die within months of each other. I think it is pretty common.
But then you can get new chicks.
Really if you want long lived pets, chickens are probably not a best fit for you. I am not saying they can't live that long, but I am saying that pretty often they don't or at least they don't live that long up here in SD.