While Millennials can generally be categorized as optimistic, tech-savvy, and team-oriented, such attitudes don’t accurately describe all Millennials. Instead, they tend to fall in six groups including Hip-ennials, Millennial Moms, Anti-Millennials, Gadget Gurus, Clean and Green Millennials, and Old School Millennials, with Hip-ennials — mostly females who are careful spenders and constantly seek information — making up the largest group. (MediaPost)