Millennials are giving a late-cycle boost to the U.S. labor market. The economy added 211,000 positions in April, reducing the jobless rate to its lowest level in 10 years. Moreover, unemployment among young people is finally echoing the national picture as they are joining the workforce in bigger numbers. It's a sign that the nearly eight-year-old recovery is broadening.

Job growth among 20-somethings has traditionally helped economic rebounds, but they've been largely missing in the current expansion. They typically have a high labor-participation rate, but it fell by 3 percentage points to around 81 percent in 2013, according to the Bureau of Labor Statistics. Record student-debt levels put many in an economic bind. For the first time in history, the percentage of 18- to 34-year-olds living in their parents' home edged out other living arrangements in 2014, according to the Pew Research Center.