Even hens that are "old" usually keep laying eggs, just less often. If you wanted babies from them I would wait. If you wanted a good return on your investment in eggs, or meat, and you wanted your payback quick, I'd send them to freezer camp and not look back.
I would wait too, even a few more months if you like the hens generally speaking. I have had hens stop laying for several weeks when I just move them from one pen to another. (dagnabit!) Oh well... If I culled everything that quit laying for a while, i'd be out of business pretty quick. I DID...