How long?

They lay eggs pretty much their entire lives, which can be up to 10 years or longer with a little luck and good care.

Their egg production begins around 5-6 months of age, and PEAKS around 2-3 years of age. Then will decline (ie, fewer eggs per week per bird), but may never completely stop, even in extremely geriatric hens. I believe there is a thread on here about someone who had a 11 or 12 yr old hen lay the occasionaly egg.

Factory farms cull their hens around 2 yrs of age, as this is when the food to egg conversion ratio declines - ie, the profit margins start to decline.

But hens may continue to lay for many more years than that.
 

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