For our older birds we take the breasts and cook them seperate. As long as they are sliced thin you can grill them, use in stir fry. The quick high heat of grilling and/or stir fry makes it tender.
For the leg quarters we cook them in the pressure cooker. 10 or 15 minutes at 15 pounds and it's fall off the bone tender, then you can bag and freeze the meat for latter use. We use it salads, enchiladas (sp), tacos etc. There are all kinds of dishes you can cook with it.
Steve in NC