All the single Millennials, all the single Millennials, put your hands up! New Gallup data shows that 64% of 18-29-year-olds were single as of 2014, just 16% were married, and 14% lived with a partner. And while those in the midst of wedding season may not believe it, the number of single people has been steadily rising for a decade, while marriage rates for thirtysomethings has steadily declined. (Refinery 29)