There's a sizable problem with that. If you move the elderly away from the cities, then you'll also have to move many of the jobs (and most of the city). Hosp

There's a sizable problem with that. If you move the elderly away from the cities, then you'll also have to move many of the jobs (and most of the city). Hospitals, doctor's offices, pharmacies, ambulance services, all will need to move to be closer to the elderly. That is often a sizable chunk of the employment in an area. Labor such as yardwork, snow removal, home repairs - things that young fit people can do themselves and can't afford to hire people for, but elderly people can't do and instead hire people for - those jobs would all need to move to be closer to the elderly. Public transit ridership often skews to the elderly who no longer drive. It's vital to their mobility. So you'd need to move public transit with them. Retail and restaurants - working people are at work in the day, a sizable chunk of the customers are older retired people. So you'll need to move the retail and restaurants as well. If you move all the elderly and all the businesses they use away from the city, what is left? Schools and offices, maybe a few bars, pawnshops, tattoo parlors, and payday loans places? Mixed-use neighborhoods are definitely a better idea than trying to ship all the elderly off to some rural area where they'd be out of the way. Society benefits from people of different ages, experiences, and classes interacting regularly instead of being segregated.