The secret to cooking older birds is to cook them slowly and with moisture. As with everything chickens there is an exception to this, you can use a pressure cooker. Those are moist but not slow. Coq a Vin is the traditional French way to make a gourmet meal out of an old rooster but it works great on old hens too. Chicken ‘n dumplings is a traditional comfort food using old chickens. Cooking them overnight in a crock pot or making a stew is common. Even if you don’t want to eat them old chickens make fabulous chicken broth or stock. A secret is to gently simmer, never bring to a full boil.
I often cook my older chickens, hens and roosters, by cutting them into serving pieces (thigh, drumstick, breasts, and wishbone) and rinsing them off but not shaking the water off. Then I coat them in herbs, usually oregano and basil, then cook them in the over at 250 degrees Fahrenheit for about 4 hours in a tightly covered baking dish. I don’t brine mine but that‘s a technique you could use to make them even more tender. I don’t add any salt to mine at any stage.
I use the wings, back, neck, gizzard, heart, and feet to make broth. I put those in a crock pot on low overnight with herbs like oregano, basil, thyme, and maybe parsley or chives, a Bay leaf, about a dozen peppercorns, and a chopped carrot, onion and celery. I put a clove or two of garlic in the mix. Cover with water. I usually let that cook on low for 12 to 14 hours then take the meat and other stuff out. I separate the fat and filter the liquid through cheesecloth. Tremendous broth. I pick the meat off the bones and out of the solids (a lot has fallen off the bone anyway) and use that in casseroles, tacos, salads, or on a sandwich. Be careful picking the meat, there are a lot of small bones.
I know where those feet have been but I blanch them for about 18 to 20 seconds, then twist the toenails off and skin the feet. If you don’t overcook them the skin comes off pretty easily. That gets the feet clean enough for me but I know some people can’t handle them. The broth will still be excellent but I find the feet add a lot of gelatin to the broth.
Is it worth cooking older hens? Not to some people but it sure is to me.