I used to hate the idea of “retirement houses”. It looked like children were abandoning their parents, they wouldn’t returned the favour for bringing them up! Lots of the other people on this planet would probably agreed. Mind you, seeing first hand a terribly tired middle-aged daughter caring for her very elderly mother with dementia, often strange, aggressive and depressed, I started looking better towards all this.
Although I still think its very important for the kids to grow seeing their grandparents often, learning from them, listening to their stories.