Living alone linked to higher death risk for adults under 65, study finds

Adults aged 18 to 64 who live alone face a higher risk of death than people of the same age living with others, and the gap is wider than among older adults, according to a study published on Tuesday, 27 October 2026, in the International Journal of Epidemiology. The research, announced by the American Cancer Society and led by Hyunjung Lee, followed 598,023 US adults. It found that living alone was linked to a 22% higher risk of death from any cause among working-age adults, against 6% among those aged 65 and over.

Students moving to a new city and first-jobbers renting a single room are among the adults who live alone. Most discussion of the health effects of living alone has focused on older people. This study finds that, in the US data, younger and middle-aged adults are the group where the link with death is stronger.

A hazard ratio compares how often an event, here death, happens in one group against another over the same period. A ratio of 1.22 means the rate was 22% higher among people living alone than among those living with others. The study is observational: it tracked what happened to people, so it shows a link, not proof that living alone causes the extra deaths.

The researchers themselves warned against a simple reading. Lead author Hyunjung Lee said, "Living alone is not necessarily harmful or a suboptimal living arrangement." According to the study, a large part of the gap is explained by other differences between the two groups: income and education, habits such as smoking and heavy drinking, access to health care and existing health conditions. The authors noted that people living alone, particularly men and middle-aged adults, were more likely to smoke and drink heavily.

The most serious finding concerns suicide, which carried the highest relative risk at every age, pointing to the link between isolation and mental health. If you or someone you know needs help, call Tele-MANAS on 14416.

Peepals calculation: The extra risk of death among people living alone was 22% for ages 18 to 64 and 6% for ages 65 and over, so the relative gap for the younger group was about 3.7 times as large (22 ÷ 6 ≈ 3.7). The part of that gap not explained by income, lifestyle, health care and health status was 42.9% for the younger group (100 − 57.1) and 14.6% for the older group (100 − 85.4), so the share left unexplained was about 2.9 times larger for working-age adults (42.9 ÷ 14.6 ≈ 2.9). Our calculation from the reported figures.

Short-term: The study adds evidence that discussions about isolation and health should include younger and middle-aged adults, not only the elderly.

Long-term: Because much of the extra risk is tied to smoking, heavy drinking, income and access to care, the findings point health planners towards those factors rather than living arrangements themselves. The unexplained part, larger in the younger group, leaves room for further research.

Who is affected: Young and working-age adults who live alone, including students and early-career workers who move away from family, and public-health planners. The data come from the United States, so the exact figures may not apply to India.

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