Nancy and Robert Houchens (71 and 68) of Charlottesville, Virginia, sold their 3,000 sq ft home and now live full-time on Carnival cruise ships for around $4,000/month - covering food, lodging, gym, and entertainment. Virginia assisted living runs $5,250/person/month, or $10,000+ for a couple. Robert put it plainly: "It's much cheaper than a nursing home."