Marriage remains the dominant living arrangement for people in their 30s. However, in contrast to the sharp rise in the percentage of 20-somethings leading a single lifestyle, 30-somethings were only slightly more likely to be single in 2014 compared with a decade earlier. This is because, while the percentage of 30-somethings who are married has declined about 10 percentage points, the percentage living together has increased significantly — nearly doubling from 7% to 13%.