And William (Bill) Hall, President, Ipsos Healthcare Japan
Japan has a word for it: kodokushi.
Literally translated as “lonely death”.
It describes a person dying alone at home and remaining undiscovered for days, weeks, or in some cases years. This is not a new phenomenon. The term entered public consciousness in the 1980s.
In 2025, the first wave of surviving postwar baby boomers (1947 -1949) comprising 17.2% of the Japanese population (some 21,240,000 in total) had all turned 75 and fell into the Japanese classification of late-stage elderly (kokikoreisha).
This demographic turning point triggered a number of government studies related to aging, including the issue of lonely death. A working group of experts reporting to the Cabinet Office had been established and, utilizing National Police Agency data, the latest report was issued in 2025.
In 2025, Japan’s National Police Agency recorded 76,941 unattended deaths or cases where a person died alone in their home. That figure represents nearly one third of all deaths handled by police nationwide. Of these, approximately 22,222 cases, or roughly 30 percent, were classified as koritsushi or “isolated deaths”, meaning the body was not discovered until at least eight days after death. Among those, 7,148 people lay undiscovered for over a month. A further 208 remained undiscovered for more than a year.
The most affected age group was 85 and over, but the sharpest concentration of prolonged isolation cases fell in the 70 to 79 age bracket — people old enough to have withdrawn from working life but young enough that their deaths might not be immediately expected by relatives and friends.
The Gender Imbalance: a new twist on the 80 : 20 rule and some sad numbers
Not long ago Dave wrote a blog post about the Japanese government’s 80:20 guideline. Decades of dealing with the world’s oldest population it had instituted policies to ensure that every one reaching 80 years of age would have every chance of having at least 20 of their natural teeth. You can read more here https://globalwellnessinstitute.org/global-wellness-institute-blog/2025/12/16/51133/
Unfortunately these new reports on dying alone reveal a different 80 : 20 rule. The statistic that has drawn the most attention, and the most difficult questions, is the gender gap. Men account for approximately 17,620 of the isolated death cases — nearly four times the 4,598 recorded for women. Expressed differently: men are 3.8 times more likely than women to die alone and remain undiscovered.
80 : 20 … men more likely to die alone.
What Lies Behind This Gender Imbalance ?
The Police Agency is tasked with ascertaining whether the death was from natural causes and not on possible reasons for this lonely death. There are no clear answers at this point, but some possible theories can be put forward.
A lack of social networks outside of the workplace: Male identity in postwar Japanese work culture was constructed almost entirely around employment — the company man who gave his working life to a single employer, worked extreme hours, socialized primarily with colleagues, and derived his sense of self from his professional role,
Such men who spent their lives inside the corporate structure had little reason, and often little time, to build friendships or social bonds outside it. Consequently, after retirement many older Japanese men find informal social connection extremely difficult to initiate or maintain
In contrast, studies show that for older Japanese women, loneliness is mitigated by participation across a range of social activities — community groups, family networks, religious organizations, friendships developed across a lifetime.
Social and domestic lives managed by wives: The gender imbalance is compounded by the domestic structure of Japanese marriages, particularly among older generations. For much of the postwar era, men worked and women managed the household and social calendar. Women maintained relationships with neighbors, arranged family gatherings, kept in contact with children and extended family. As a consequence, many older Japanese men had their entire social and domestic lives managed for them by their wives.
When those marriages end through bereavement or divorce, which has risen among older Japanese couples in recent decades, men are left without the infrastructure their wives had quietly maintained.
Increasing number of the unmarried: Important as these sociocultural factors may be in explaining gender differences related to lonely death, a more fundamental factor may also be at work.
According to a study issued in 2025 by the National Institute of Population and Social Security Research on “Future Projections of the Number of Households in Japan”, in 2025, among persons 65+ years of age who are living alone, 37.7 % of males and 12.3% of females respectively were unmarried.
By 2050, the percentage of unmarried 65+ males living alone is expected to reach a staggering 59.7% vs. 30.2% for females,
According to the institute, the rise in the number of elderly people living alone is largely due to an increase in unmarried people. As of the 2020 census, the percentage of those who had never been married by the age of 50 was 28.25% for males and 17.81% for females.
If we factor in the above-mentioned sociocultural factors related to older males not having established networks outside of their work environment after retirement, and combine this with the lack of a wife, children, or grandchildren to check on one’s wellbeing, then it is perhaps not entirely surprising that a lonely death is significantly higher among males vs. females.
Other Societal Impacts: From a local government perspective, if no one comes to claim the body of the deceased, then the local authorities need to attempt to track down relatives in regard to inheritance matters (including for funds in bank accounts for which a password may not be available), to arrange for storage of the deceased belongings, cleaning up of the dwelling of the deceased, cremation and burial. These activities all create an additional societal cost on already strained local government budgets
A Crisis With No Easy Fix
Japan’s government has begun responding: community monitoring programmes, volunteer welfare check services, motion sensor systems in apartment buildings. Some local authorities have set up networks specifically targeting isolated elderly men. But these interventions are reaching the edges of a problem whose roots run deep into the foundations of how postwar Japanese society organised itself.
Kodokushi is not simply a story about loneliness. It is the final ledger entry in a life that does not end with songenshi (death with dignity), something to which all of us aspire.
