Del Webb buyer profiles indicate the percentage of single female home buyers has steadily increased, now representing one-in-five Del Webb buyers. PulteGroup's analysis here looks at the trend, and the needs of single-person Baby Boom buyers.

Do the math on that and project: That amounts to about 5 million potential buyers for Del Webb alone, not to mention other new 55-plus age targeted and mixed age communities. The PulteGroup study notes:

28 percent of single female baby boomers anticipate they will have a change in their housing needs within the next five years. While more than half (60 percent) of those plan to make the move to smaller housing accommodations, they aren’t willing to give up on dream home features.