Homeownership among young adults under age 35 has dropped substantially, particularly among prime first-time homebuyers, despite the fact that owning a house has become less costly than renting in recent years, according to a Fannie Mae analysis. Specifically, the government-sponsored enterprise found that the homeownership rate of “prime” first-time homebuyers – defined as educated, married couples in their early 30s with kids and lots of money – fell by 8.6 percent between 2006 and 2012 ...