SURVEYS, some by market research companies that study behavior for clients developing products and services, also indicate that married people with children are more likely than single people to hunker down at home. Those in large suburban homes often splinter into private rooms to be alone. The image of a modern family in a room together, each plugged into a separate reality, be it a smartphone, computer, video game or TV show has become a cultural cliché.

New communications technologies make living alone a social experience, so being home alone does not feel involuntary or like solitary confinement. The person alone at home can digitally navigate through a world of people, information and ideas. Internet use does not seem to cut people off from real friendships and connections.

The Pew Internet Personal Networks and Community Survey — a nationally representative survey of 2,512 American adults conducted in 2008 that was the first to examine how the Internet and cellphones affect our core social networks — shows that Web use can lead to more social life, rather than to less. “Social Isolation and New Technology,” written by the Rutgers University communications scholar Keith Hampton, reveals that heavy users are more likely than others to have large and diverse social networks; more likely to visit parks, cafes and restaurants; and more likely to meet diverse people with different perspectives and beliefs.

Today five million people in the United States between ages 18 and 34 live alone, 10 times more than in 1950. But the largest number of single people are middle-aged; 15 million people between ages 35 and 64 live alone. Those who decide to live alone following a breakup or a divorce could choose to move in with roommates or family. But many of those I interviewed said they chose to live alone because they had found there was nothing worse than living with the wrong person.

In my interviews, older single people expressed a clear preference for living alone, which allowed them to retain their feelings of independence and integrity, and a clear aversion to moving in with friends or family or into a nursing home.

According to research by the Rutgers sociologist Deborah Carr, at 18 months after the death of a spouse, only one in four elderly men and one in six elderly women say they are interested in remarrying; one in three men and one in seven women are interested in dating someday; and only one in four men and one in 11 women are interested in dating immediately.

Most older widows, widowers and divorced people remake their lives as single people. A century ago, nearly 70 percent of elderly American widows lived with a child; today — thanks to Social Security, private pensions and wealth generated in the market — just 20 percent do. According to the U.C.L.A. economist Kathleen McGarry: “When they have more income and they have a choice of how to live, they choose to live alone. They buy their independence.”