One of the most notable social changes is that some 32.7 million people in the U.S. are living alone, many by choice, reports CBS Sunday Morning. That computes to roughly one of seven adults, compared to 4 million in 1950, according to Eric Klinenberg, Professor of Sociology, Public Policy, and Media, Culture, and Communications at New York University.Four of 10 households in Seattle, San Francisco, Cleveland and Denver consist of a single person, and a whopping half of New Yorker's say, "I am or want to be alone." Demographically speaking, one-third are 65+, one-half are 35-64-years-old, and women outnumber men.And although singles tend to eat out more often, keep those single-serve portions coming.