On a mild December day, about an hour's drive from Atlanta, heavy competition going on. Pool volleyball, pickleball, mahjong, and a big bet by a big home builder on how the nation's nearly 80 million baby boomers want to live. At Sun City Peachtree, Pulte Homes has already put about 800 new homes in the ground, and the plan is for about 2,600 more.

"We have really seen a resurgence in the active adult market. It typically comes back a little slower than the rest of the market, but for the first three-quarters of this year, our sales comps for active adult are up 22 percent," said Richard Dugas, CEO of Pulte Homes.