The U.S. homeownership rate dropped for the ninth year in a row in 2013, thanks in no small part to the fact that millions of 20- and 30-somethings were still living with their parents, according to the latest "State of the Nation's Housing" report from Harvard University's Joint Center for Housing Studies. The decline in homeownership rates from 2004 to 2013 was most dramatic among 25- to 34-year-olds (down nearly 8 percentage points) and 35- to 44-year-olds (down 9 percentage points). Some 15.3 million adults in their 20s and 3.1 million in their 30s were still living with their parents last year, helping bring the homeownership rate down to 65.1 percent. Real median income for households aged 25 to 34 fell 11 percent from 2002 to 2012, to levels below those enjoyed by people i...