At the beginning, he was mostly frustrated because he couldn't drive anymore (falling asleep too much) and so he was very bored. He took up some hobbies (mostly carving or drawing) but even then, he was restless and often wanted to make dramatic changes to the living arrangements. He thought he could work a part-time job, but because of his other physical issues (he was very weak and it was hard for him to go up stairs or walk or stand for any length of time) he didn't really have much he could do.
We got to know each other well, and my daughter was a saint in helping him a lot when we weren't there (especially during the summers). He cooked for us a lot, especially at the beginning, but towards the end, we had hospice care and he was essentially helpless.
I don't regret it for one second. It was difficult, but we were there to help him with the medical system (it's a zoo), insurance, and just helping him with his phone or his tablet really helped calm him down. We all got to know him really well, and he and my wife were able to reconcile a lot of old issues they had.
He died peacefully at home, surrounded by family, with a stomach of home-cooked food he loved, listening to his granddaughter play the violin. Again, I don't regret it for a second, even though it's emotionally very difficult.