I agree with the "this is something that should be thought about before getting into chickens" comment, i know for us my plans were just to keep as pets... we only have 4 so it's not hard in the least to do that as the laying slows off.
That said good ideas have been posted, you can give them away (with full disclosure on their aging) or have them processed if that is an area you don't want to go yourself. Again, i am fortunate being rural, i have plenty of room.. so a couple hens as pets will make little difference in the grand scheme of things, i really haven't decided whether i will buy more chickens down the road, at this point i will see how they continue to lay as of the moment they aren't even 1yo.