My mum was hundreds of miles away in Scotland. She didn't want to move to England, and we had jobs and teenage children at school, so couldn't just up sticks. Mum's rented flat was fine, her brother and sister in law and friends were nearby, and she had a reasonable social life. Several strokes and the outcome was care. My uncle and aunt eventually had the same situation, their children were in NZ and Canada.
My inlaws both died before they needed care, younger than we are now. I felt very guilty about my mother's situation, even though I knew she was being looked after. It doesn't really help to read comments suggesting everyone has the same solution.