"According to the 2010 census, there were 40.3 million people age 65 and older as of April 2010, a rise of about 15 percent from 2000. In contrast, the nation as a whole grew by 9.7 percent. That is a change from the decade before, when the nation grew faster than the elderly population.
The fastest growing group was those ages 65 to 69, up by a third from 2000. That group will expand even more rapidly in the decade to come, starting in 2011, as baby boomers begin to turn 65. "
Yes, they have a recurring revenue model. I think it's $29.95 month if I recall correctly (about $1/day).