By ERIC KLINENBERG
NY Times Published: February 4, 2012

MORE people live alone now than at any other time in history. In prosperous American cities — Atlanta, Denver, Seattle, San Francisco and Minneapolis — 40 percent or more of all households contain a single occupant. In Manhattan and in Washington, nearly one in two households are occupied by a single person.

By international standards, these numbers are surprising — surprisingly low. In Paris, the city of lovers, more than half of all households contain single people, and in socialist Stockholm, the rate tops 60 percent.

The decision to live alone is common in diverse cultures whenever it is economically feasible. Although Americans pride themselves on their self-reliance and culture of individualism, Germany, France and Britain have a greater proportion of one-person households than the United States, as does Japan. Three of the nations with the fastest-growing populations of single people — China, India and Brazil — are also among those with the fastest growing economies.

The mere thought of living alone once sparked anxiety, dread and visions of loneliness. But those images are dated. Now the most privileged people on earth use their resources to separate from one another, to buy privacy and personal space.

Living alone comports with modern values. It promotes freedom, personal control and self-realization — all prized aspects of contemporary life.

It is less feared, too, for the crucial reason that living alone no longer suggests an isolated or less-social life. After interviewing more than 300 singletons (my term for people who live alone) during nearly a decade of research, I’ve concluded that living alone seems to encourage more, not less, social interaction.

Paradoxically, our species, so long defined by groups and by the nuclear family, has been able to embark on this experiment in solo living because global societies have become so interdependent. Dynamic markets, flourishing cities and open communications systems make modern autonomy more appealing; they give us the capacity to live alone but to engage with others when and how we want to and on our own terms.

In fact, living alone can make it easier to be social, because single people have more free time, absent family obligations, to engage in social activities.

Compared with their married counterparts, single people are more likely to spend time with friends and neighbors, go to restaurants and attend art classes and lectures. There is much research suggesting that single people get out more — and not only the younger ones. Erin Cornwell, a sociologist at Cornell, analyzed results from the General Social Survey(which draws on a nationally representative sample of the United States population) from 2000 to 2008 and found that single people 35 and older were more likely than those who lived with a spouse or a romantic partner to spend a social evening with neighbors or friends. In 2008, her husband, Benjamin Cornwell (also a sociologist at Cornell), was lead author of “The Social Connectedness of Older Adults,” a paper in the American Sociological Review that showed that single seniors had the same number of friends and core discussion partners as their married peers and were more likely to socialize with friends and neighbors.

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.”

Some unhealthy old people do become dangerously isolated, as I learned when I researched my book about the hundreds of people who died alone in the 1995 Chicago heat wave, and they deserve more attention and support than we give them today. But the rise of aging alone is also a social achievement. The sustained health, wealth and vitality that so many people over age 65 enjoy allow them to maintain domestic independence far longer than previous generations did. What’s new today is that the great majority of older widows, widowers and divorced people prefer living alone to their other options, and they’re willing to spend more on housing and domestic help for the privilege. Some pundits predicted that rates of living alone would plummet because of the challenged economy: young people would move into their parents’ basements; middle-aged adults would put off divorce or separation for financial reasons; the elderly would move in with their children rather than hold on to places of their own.

Thus far, however, there’s little evidence that this has happened. True, more young adults have moved in with their parents because they cannot find good jobs; but the proportion of those between 20 and 29 who live alone went down only slightly, from 11.97 percent in 2007 to 10.94 percent in 2011. In the general population, living alone has become more common — in absolute and proportional terms. The latest census report estimates that more than 32 million Americans live alone today, up from 27.2 million in 2000 and 31 million in 2010.

All signs suggest that living alone will become even more common in the future, at every stage of adulthood and in every place where people can afford a place of their own.