A recent study by sociologists at Duke and the University of Arizona found that, on average, most adults only have two people they can talk to about the most important subjects in their lives — serious health problems, for example, or issues like who will care for their children should they die. And about one-quarter have no close confidants at all.
From an article in The New York Times
Key quote: “But gosh, the number of friends you have is a strong predictor of how long you live.”