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.

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