Goldman Sachs has an excellent infographic/report on millennials (born 1980 to 2000).
They describe Millennials as:
Millennials have come of age during a time of technological change, globalization and economic disruption. That’s given them a different set of behaviors and experiences than their parents.
They have been slower to marry and move out on their own, and have shown different attitudes to ownership that have helped spawn what’s being called a “sharing economy.”
They’re also the first generation of digital natives, and their affinity for technology helps shape how they shop. They are used to instant access to price comparisons, product information and peer reviews.
My favorite report chart is below and shows the large drop in the percentage of young adults who are married and living in their own household.
This report is one of the best, quick overviews of Millennials and their attitudes I've seen.