The largest and most comprehensive nationally-representative study of single men and women ever done dispels long-held beliefs about singles in America. Although there are 105 million singles in the United States, representing one-third of the US population, these women and men have gone largely unstudied - even as their attitudes and behaviors are shaping America's cultural norms and challenging traditional foundations. Based on this groundbreaking study, a new picture of single Americans emerges that is radically different than it was 50 years ago when the median age of first marriage for women was 20 and only 10% of women ages 25-29 were not married. The single today is defying gender and age stereotypes, adopting new dating habits, and changing the very definition of relationships.