OP my FIL is in his 80s, still living in his own home. Both children living about 100 miles away.
He has stopped driving but is still very independent, catches the bus to town, takes Taxis to see friends. His older Grandchildren are also involved in keeping an eye on him.
In your 60s you are still pretty young, most of us will still be working.
I think you are worried about the future, but rather than discuss it you have come up with the solution which seems best to you. BUT what we are trying to point out here, by the time your parents need more help - a lot of things will have changed. If it is in 20 years time: your DC could have left home, will certainly have left school. Just think of all the things that could happen over the next 20 years: health scares, DH getting a new job overseas, changes to your relationship, their area could become trendy and prices increase.
They may say nice things about where you live, but that could be just being polite eg. a Londoner going to visit country friends and being complimentary but thinking: "I'd go mad here there is nothing to do" or even "The Country is okay when you are young, but I'd rather grown old in the city centre where everything is on your doorstep". Lots of us like visiting places that we would want to live in, although can see its ideal for others.
Do talk to your parents about preparing for the future: lasting powers of attorney (or whatever they are now called), what will happen to your brother - have they investigated, what they would like to happen if they get frail. But it is talk to them, not tell them what to do.