At our ages, and my husband and I are not that far away from yours, it makes no sense, and I believe we still retain a very clear sense of what is good for us- I say stay put. I had to take care of my aging parents when they were beginning to show signs of shutting down and their finances DEMANDED they come near us. They didn’t want to be a burden as they often said but it was a necessity. I took care of them, their medical needs, their transportation and everything else imaginable. I loved them dearly and miss them still. It was a huge health burden on me as I’m the only child. I think our adult children mean well but ultimately we ARE a burden and then there is form of “loving” neglect” if that makes any sense. The promises and good intent are there, but they still have their own lives to lead.
You have a good thing going even tho distance makes it sad and disconnected. Right now, count your blessings and stay in close contact.