The best method I've found for cooking older birds is the pressure saucepan. I had some RIR that were about 2 years old, not laying, plus they were pretty mean to some of the other birds. So when I butchered my meat birds, I put the 3 RIR's in my freezer as well.
I just cooked on the other day - After thawing I cut it up into pieces and put them in the pressure saucepan with about 3c. water. Put the lid on, and once I was getting steam out the vent on the top of the lid, I added the weight. Once the weight was jiggling (that's when you know you have pressure) I let it cook about 30-40 minutes. I'm not sure on the time because I got distracted by a phone call.
When it was done, I put the saucepan in the sink and ran water over it to bring the pressure down. I took off the lid, removed the chicken parts to a bowl to cool, and then let the broth sit so I could skim off the fat. There was a lot more broth than the 3c. of water, and it was really rich and concentrated.
Once the chicken was cool enough, I removed it from the bone. I cut the white meat in fairly large chunks for chicken soup with carrots, celery and homemade noodles. I hadn't put any seasoning in with the chicken, so I added a little salt, pepper. parsley, onion powder and garlic to the broth. It was really good, also tender. The biscuits on the side were good too!
I shredded the dark meat and mixed it w/barbecue sauce and chipotle tabasco and we ate it as barbecue sandwiches. It was tender and yummy too! We had it with slaw, baked beans and sun tea.
Hope this is helpful!