It used to be that if you were looking for a place to retire, you found a warm community with shuffleboard and golf and called it a day. But as America's 78 million baby boomers approach their sunset years, the generic retirement model is starting to give way to what developers are calling affinity housing--niche communities where choosy boomers can opt to grow old alongside others who share a specific interest.
Can't get enough Garth Brooks? A community planned by the Country Music Association in Franklin, Tenn., will offer music-industry retirees a range of living options, from standard apartments to nursing-home...