Actors Christopher Mintz-Plasse, Jonah Hill and Michael Cera arrive at the premiere of "Superbad" in 2007. (Image credit: Jason Merritt/FilmMagic/Getty Images) Millennials are a scrappy lot, having to adjust to major tech advances and financial shocks early in their lives. They came of age during the Great Recession of 2008-2009; they're perhaps best known as the generation mired in so much student debt that they've often delayed key life milestones such as buying a house and getting married. The lousy economic timing has also set millennials back when saving for their retirement. From just $107.88 $24.99 for Kiplinger Personal Finance Become a smarter, better informed investor. Subscribe from just $107.88 $24.99, plus get up to 4 Special Issues CLICK FOR FREE ISSUE Sign up for Kiplinger’s Free Newsletters Profit and prosper with the best of expert advice on investing, taxes, retirement, personal finance and more - straight to your e-mail.…