Some of the heritage breeds here in Oz have a life expectancy of @ least 12 years. I don't know how that works in the states. I bought my 1st 5 2 1/2 years ago for just that reason. I have 2 left. There are still illnesses that can take them out, predators & one of mine was lost to broodiness while I was away. It is always a bit of a gamble.I thought we bred them that way? To lay so many eggs, that is. Or is it just the high production breeds?