At what age does a chicken stop laying?

[TomF]

I have two Plymouth Rocks that were born April 2009
In October of 2012 they both stopped laying.
Behold.. on January 12th, an egg, and since then a total of nine wonderful eggs.

I noticed there waddles and cones are bright red again.

 

[BeulahBreezes]

Most chickens slow down or stop laying eggs in the fall when we have less daylight hours. 2 of mine stopped totally and the other two slowed way down. They are all starting to lay more often now.....yay! ~Beulah