"The Census Bureau says there are about 41 million renter households in the United States, a group making up about 35 percent of the country. And the renter ranks are expected to swell this decade as the housing demand of Baby Boomers and their children starts to converge. Twentysomethings who’ve been living at home during the recession will finally move out to form their own households. Many Baby Boomers, meanwhile, are expected to downsize into smaller rentals units where they won’t have to mow their own lawns."
Source:
http://www.theatlanticcities.com/housing