Japan Lives Longer Because Its Care Homes Keep Frail People Alive, Not Because Its Population Is Healthier

At 82, a woman in a Japanese care home is, statistically, somewhere she is less likely to die than her counterpart in Sweden. Not marginally less likely. Substantially. Among women living in residential care, the age-standardised death rate in Japan runs to roughly 148 fewer deaths per thousand person-years than in Sweden. That is an enormous gap. And here is the part that changes how you have to think about Japan’s legendary longevity: among older adults living independently, with no formal care at all, the two countries are essentially the same.

Japan’s reputation as a nation of exceptional survivors rests on something most people would not guess. It is not, or at least not primarily, that Japanese people are healthier in old age. It is that when they become frail, they seem to survive longer.

That is the central finding of a new study published in BMC Medicine by researchers at Karolinska Institutet, Kyushu University, and Kobe University. The team tracked more than 850,000 people aged 75 and over in Sweden and over 330,000 in nine Japanese municipalities, sorting them into three groups: those with no formal elder care, those receiving home care, and those in residential care homes. Then they compared death rates and life expectancy across all three groups. The results were not what the standard narrative about Japan would lead you to expect.

“Perhaps Japan’s long life expectancy is not primarily due to the population being healthier?” says Karin Modig, associate professor at Karolinska Institutet and the study’s lead researcher. “Our findings paint a more nuanced picture and instead suggest that the differences mainly arise among those who require care.”

The numbers bear this out in some detail. A 75-year-old Japanese woman can expect, on average, 10.4 years without formal care, compared with 9.9 for a Swedish woman of the same age. Half a year. Not trivial, but not the stuff of longevity legend either. Total life expectancy at 75, though, runs to 15.5 years in Japan versus 13.7 in Sweden. Nearly two years. The extra time is almost entirely concentrated in the care years: a Japanese woman in formal care can expect about 5.1 more years of life, against 3.8 for her Swedish peer. For men the picture is far less dramatic, with the two countries nearly identical across all groups, but among women the divergence is striking.

“This means that Japanese women can expect to spend more years in elder care, but we need to understand what drives these differences,” says Shunsuke Murata, a researcher at both Karolinska Institutet and Kobe University who led the statistical analysis. “It is important to identify which aspects of elder care influence longevity, especially as more people live to very old ages.”

What the data cannot tell you directly is why. Several hypotheses circulate, and the researchers discuss them at some length. The most straightforward is that Japanese elder care is simply more intensive, with more medical intervention and more active life-sustaining treatment for people who are already old and frail. Japan does indeed perform at or near the top globally on metrics like hospital admissions per capita, doctor consultations, and length of inpatient stay. It also has one of the highest proportions of in-hospital deaths in the world. Whether this reflects better care, or more care regardless of whether it is better, is a rather harder question.

A second possibility is that the populations entering formal care are not quite comparable between the two countries. Japan uses a standardised national assessment system with seven care-need levels; Sweden relies on decentralised municipality-level assessments focused on inability to manage independently. Out-of-pocket care costs are higher in Japan, which may push families toward informal care for longer, meaning that people who eventually enter formal care in Japan may, on average, be somewhat healthier than their Swedish equivalents when they cross that threshold. The data offer a partial hint here: Japanese home care recipients are slightly younger than Swedish ones, which could suggest earlier entry, or (the authors concede) something more complicated. Notably, one earlier comparative study found that among those with severe care needs, Japanese individuals actually showed greater functional limitations than their Swedish counterparts, which would argue against the idea that Japan’s care recipients are systematically healthier.

A third angle concerns family. Japan has markedly higher rates of multigenerational living and informal family care than Sweden, where living alone in old age is considerably more common. Sweden’s welfare model is built, in part, around the assumption that people will not have family caregivers available; Japan’s is not. This means the “no formal care” group in Japan may contain more people with real but informally met needs, which could explain the slightly elevated mortality researchers found among the very oldest Japanese without any care.

What is harder to dismiss is the scale of the mortality gap in care homes specifically. A difference of 148 deaths per thousand person-years between Japanese and Swedish women in residential care is large enough that it is unlikely to be explained away entirely by compositional differences in who ends up there. Something about what happens after you enter care appears to differ materially between the two countries. Whether that something is to be envied or questioned depends on your values as much as your epidemiology. Japan’s high rate of in-hospital death and aggressive end-of-life treatment keeps some people alive longer; it does not automatically follow that those extra months are experienced as a gift.

Sweden, for its part, performs well by most healthcare quality metrics, ranking near the top globally for cancer and cardiovascular care. It does not, however, rank near the top for old-age mortality. If Swedish policymakers want to close the gap, this study suggests that prevention and healthy ageing campaigns will only get them so far. The care system itself, and particularly what happens to people once they are in it, may be where the larger leverage lies.

The researchers have already begun a second phase of the project, which will examine health trajectories across different stages of care rather than treating each stage as a single static category. The goal is to map not just who survives but what their health looks like along the way. In a world where the number of people reaching very old ages is climbing, and where most of those years will involve some degree of dependency, that question is becoming harder to avoid.

DOI / Source: https://doi.org/10.1186/s12916-026-04786-z