I did have 45 chickens and 4 guineas bit some critter has gotten three of them. (Dog I think) So I am down to 4 guineas, 3 roosters, 39 hens. Then of course just hatched 7 chicks so am back up to 49 chickens.
I do not know how long they live. My book says normal life is 12 years. Some have lived as long as 25 years. BUT....most don't survive past their productive life of 2 years :shock:
Get this book.... Storey's Guide to Raising Chickens by Gail Damerow..... It tells you more than you want to know about chickens. :-D