No, this does not refer to retirement homes such as you are imagining for senior citizens. This is a fictitious tale of what I imagine a lightkeeper might look for in a home when he retires. None of these homes are actually inhabited by a lighthouse keeper, as far as I know, but they appealed to me as a place where a keeper might like to retire.
Most keepers hate to leave their lighthouse homes at all, but sometimes, as in my case, retirement beckons too strongly and we give up the solitary life. Maybe we would move into . . .
I saw this little dwelling and its location and immediately fell in love with it. It is isolated; it is near water; it even has a boat (note the kayak beneath the house). I still ride a bicycle, so why not paddling a kayak into old age? Perfect location for me.
The photograph is by Irene Becker for National Geographic Picture of the Day: A Tiny River House in Serbia. The website says:
A house in the middle of the Drina River near the town of Bajina Basta, Serbia. The Drina is a 346 km long river that forms much of the border between Bosnia and Herzegovina and Serbia. It is the longest tributary of the Sava River and the longest karst river in the Dinaric Alps.