cities cost more for smaller spaces. when you've got a family you need that space, but for two empty-nesters, a city location is smaller, easier to manage, and closer to things. elevators and small apartments on a single floor might even be preferable -- no stairs for bad knees.

also if you're not able to drive cuz your eyes or reaction time are bad, being walkable helps -- that exercise might even keep grandpa healthier, longer.

and in the case of my in-laws, a big draw was proximity to (good) medical care. literally walkable to the local hospital and medical services, and if something goes bad the ambulance can get them there ASAP.

and then you have more food options, more entertainment, etc.