I am going to live alone in my retirement house as long as I can. Hopefully I can avoid becoming a burden on my daughter and her husband-to-be, by entering a continuous care facility at some point, perhaps in my early 80's. That way they won't have to worry about me so much. I will approach it with a positive attitude.
My mother lived in a facility like that for 22 years (from 1985 to her death in 2007 at almost 98 years old). She really enjoyed it. Most of the time she had her own room (though during the last few years she had to spend some time in the skilled nursing unit.) There was a lot for the younger residents to do. They had optional social activities, a gym with a personal trainer, a hairdresser, a little library, and healthy, nutritious food (as well as more "sinful" stuff if desired). Sounds fine to me. If you didn't show up for meals, someone would come to your room to make sure you were OK.
The timing for this may depend on how Frank is doing by that time, since we could check on one another until one of us is gone. I can't see living alone without having someone to check on me, though. For those who wish to remain at home, and have no relatives nearby, I would suggest making an arrangement for a daily visit by someone to check on you and see if you are OK or need help of any kind.