I don't have chickens yet, but I am thinking about it seriously. We are thinking about starting with layers. I understand that they lay for a couple of years, and then stop. I am thinking about getting additional birds as meaties, but I also don't want an ever-increasing flock of layers that become pets. I have two dogs already I don't know if I'll want to eat them if they have been around for two years. I know I'll have to get more when the original ones stop laying. How long do they live?