I have a client who spends most of her life on ships. She said she priced a retirement home as she was no longer capable of taking care of the home she was in. It was going to run $250. per day. Says by planning carefully she can be on a ship for about $150. -$200. on average (depending on the season) even with laundry and other non-cruise related expenses.
I like the way she thinks. I now know where my 401K will be spent when it comes that time.