WASHINGTON — U.S. mobility for young adults has fallen to the lowest level in more than 50 years as cash-strapped 20-somethings shun home-buying and refrain from major moves in a weak job market.

The new 2013 figures from the Census Bureau, which reversed earlier signs of recovery, underscore the impact of the sluggish economy on young people, many of them college graduates, whom demographers sometimes refer to as “Generation Wait.”

Burdened with college debt or toiling in low-wage jobs, they are delaying careers, marriage and having children. Waiting anxiously for their lucky break, they are staying put and doubling up with roommates or living with Mom and Dad, unable to make long-term plans or commit to buying a home — let alone pay a mortgage.

Many understood after the 2007-2009 recession that times would be tough. But few say they expected to be in economic limbo more than four years later.