The portion of young adults in the United States who have completed a four-year college degree hit a record high in 2012, the Christian Science Monitor reports. A full third of 25- to 29-year-olds now hold degrees. Ninety percent have completed high school or an equivalent credential, and 63 percent have done some college course work – both peak rates as well. Progress in “educational attainment … has a lot of implications, both for the wealth and well-being of the young adults themselves … and [for] the productivity of the workforce and future economic growth,” says Richard Fry, a senior research associate at the Pew Research Center [1] and co-author of its new report [2] on the subject…