My flock in the Avatar have lived for 6--8 years. The remaining three hens are not laying, but I am keeping them until they pass away naturally (unless they are suffering and I have to euthanize them) and I have recently brought in five new girls and one male. They accepted the hens quite quickly, although the old girls are not keen on the young male's attentions. I hope in future to allow the hens to raise their own chicks to replace the layers so I don't have to introduce new birds. The male is not related to them.