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51 and 61 years old grew from 20 to 26% (Henry, Bishop, et al., 2018).

      The story for families with children is different. In the New York City data, from 1988 to 2005, the modal age of heads of families remained 21–23 (Culhane et al., 2013). More recent national data on families suggest an older typical age, as only 23% of adults in families using shelters at some time during 2017 were between the ages of 18 and 23. There was only a very small aging trend between 2007 and 2017 (Henry, Bishop, et al., 2018). Because infants and preschool children are common in families experiencing homelessness, it may be the age of children rather than the age of their parents that is critical for families. About half of the children in families using shelters over the course of a year are under the age of 6, and 11% are infants less than 1 year old (Henry, Bishop, et al., 2018). The slight increase in age of mothers may be because the mean age of U.S. mothers generally at the time their first child was born increased from 24.1 in 1988 to 26.8 in 2017 (Martin et al., 2018; Mathews & Hamilton, 2002). The number of adult men in homeless families is increasing (Henry, Bishop, et al., 2018), but this may be a function of the increasing willingness of shelters to accommodate couples rather than the changing composition of the families themselves.

      The last decade has seen important changes in the numbers of people experiencing homelessness—changes that are particularly marked for people with chronic patterns of homelessness and for veterans. Overall, the number of people counted nationally in PIT counts decreased almost 15% from about 647,000 in 2007 to about 553,000 in 2018. Most of the drop of close to 100,000 total people was among people who were unsheltered. The numbers of people in shelter (on a single night) stood at about 391,000 in 2007, rose a bit during the aftermath of the Great Recession, came back to 391,000 in 2015, and has dropped a bit—to 358,000—since then. The additional progress in the last 3 years has been partially offset by a smaller increase in the unsheltered population (Henry, Mahathey, et al., 2018).

      The number of veterans experiencing homelessness nationally fell even more dramatically from about 73,000 in 2010 (the first year data were available), to about 38,000 in 2018 (Henry, Mahathey, et al., 2018). We believe that federal and local policy efforts that we will describe later, in Chapters 3 and 4, account for cutting veteran homelessness nearly in half. These decreases, especially for veterans, show what can be done with concerted effort.

      We have HUD's estimate of 553,000 people on a single night in January, 2018. Given the likely undercounts of people staying in unsheltered locations, the total number of people experiencing homelessness in the U.S. nationwide on a particular night in January 2018 was probably more than 600,000.

      Thus far we have estimates of people homeless on a particular night (sheltered and unsheltered, about 600,000 people) and people homeless over the course of a year in shelters (about 1.6 million people). But a year is a short period of time. Much larger estimates of the number of people experiencing homelessness come from asking people who are living in conventional housing about homelessness they experienced at some time during their lives and not just in the past year or two.

      Back in 1990, researchers led by Bruce Link undertook a study of public attitudes toward homelessness with a rigorous sample survey of adults in households with telephones in the continental United States. Because they thought that those attitudes might be influenced by people's personal experiences of homelessness, they decided to ask about those experiences and then to ask some follow‐up questions to anyone who acknowledged having been homeless in the past. Survey organizations charge researchers by the minute for asking questions, thus the organization Link hired to do the survey had to come up with some sort of estimate of the number of people who would be asked the follow‐up questions. Organizational representatives decided it would be such a small number that it would not be worth any charge. (After all, this was a household survey—anyone currently homeless or staying in a prison or mental hospital—who might be at higher risk of having been homeless in the past—would not be included.) They guessed wrong.

      The researchers asked about total duration of homelessness (including doubling up): the most frequent reply (46%) was between a month and a year. Only 8% had been homeless for less than a week, 33% between a week and a month, and 13% for over a year. In 1990 there were slightly over 185 million adults living in the United States, so the researchers estimated that 13.5 million adults had been literally homeless at some time in their lives, and nearly 26 million had considered themselves homeless if doubling up is included (p. 1910). The fact that many people are homeless for fairly short periods is also shown in later analyses of shelter records by Culhane et al. (2007; Kuhn & Culhane, 1998) and explains why the numbers for lifetime homelessness are so much larger than the numbers for any given night or year.

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