Not all seniors want or are able to remain in the same house, especially after the loss of a spouse. While some do choose to stay and "age in place" alone, others opt to head to a community near an adult child.
Many older folks want to remain independent and choose a small, single-family home, while others choose to try out an apartment. They often have specific issues and needs -- the same issues and needs baby boomers will face in a short few years.
After living so many years in the same place, these decisions are huge. Some don't know where to start, and neither do their adult children.