Bluntly put because our society would rather not think about age and dying. So the baby boomers thought they would live forever and built retirement home and as

Bluntly put because our society would rather not think about age and dying. So the baby boomers thought they would live forever and built retirement home and assisted living facilities to shove their parents into once they became inconvenient and/or reminders of mortality, now they are the ones being moved in there and all of the support system (social, community, familial levels) of previous generations have almost all gone away. Building new ones would require a change in society and its values and that is a hard slow and expensive thing to change.