it becomes tougher to meet the three conditions that sociologists since the 1950s have considered crucial to making close friends: proximity; repeated, unplanned interactions; and a setting that encourages people to let their guard down and confide in each other, said Rebecca G. Adams, a professor of sociology and gerontology at the University of N... See more

Our story is not unusual. In your 30s and 40s, plenty of new people enter your life, through work, children’s play dates and, of course, Facebook. But actual close friends — the kind you make in college, the kind you call in a crisis — those are in shorter supply.