Neighborly contact at 65 linked to taking up social activities by 70

Older adults who kept in touch with their neighbors at age 65 were more likely to start participating in social activities over the following five years, according to a long-term study of Japanese residents tracked from early old age into their seventies. The finding comes from the New Integrated Suburban Seniority Investigation Project, or NISSIN Project, an age-specific cohort study conducted in Nisshin City, a suburban community just east of Nagoya in central Japan, and published in the journal Discover Aging.

The study followed 1,688 community-dwelling adults who completed questionnaires at age 65 and again at age 70.

In the baseline questionnaire, participants were asked about contact with their neighbors using a single item with three response options: not doing, occasionally doing, and regularly doing. The study treated these three response options as the exposure categories: none, sometimes, and regularly. Social participation was assessed separately, using ten items covering community events, neighborhood associations, senior citizen club activities, hobby groups, volunteer activities, sharing skills or experience with others, senior college activities, culture center learning activities, public lectures or study groups, and activities at a Silver Human Resources Center. Each item was scored 3 for regularly doing, 2 for occasionally doing, and 1 for not doing, and a total score of 10, meaning a participant answered not doing to all ten items, indicated nonparticipation.

Based on participation status at both surveys, participants were classified into four groups: persistent nonparticipation, initiation, cessation, and continuation. Among the 1,688 participants, 102 remained nonparticipants across both surveys, 206 started participating, 66 stopped, and 1,314 continued throughout. The initiation analysis was restricted to the 308 participants who reported nonparticipation at age 65, while the cessation analysis included the 1,380 who had been participating at baseline.

In the fully adjusted model, the researchers adjusted for sex, entry year, body mass index, smoking, alcohol consumption, education, marital status, living arrangement, work status, walking time, exercise frequency, daily living competence, depressive symptoms, hypertension, diabetes and cardiovascular disease, and the results showed a consistent pattern for initiation. Compared with participants who reported no neighborhood interaction, those who reported contact sometimes had a relative risk of initiation of 1.29 (95% confidence interval, 1.06 to 1.58), and those reporting regular contact had a relative risk of 1.33 (95% confidence interval, 1.05 to 1.68). In other words, having any neighborly contact at age 65 was associated with roughly a 30 percent higher likelihood of joining at least one social activity by age 70.

The picture for stopping was different. Neighborhood interaction showed no clear association with overall cessation of social participation: the fully adjusted relative risks were 1.23 (95% confidence interval, 0.58 to 2.64) for sometimes and 1.07 (95% confidence interval, 0.48 to 2.40) for regularly, compared with no contact. The confidence intervals were wide, and the authors note that the number of cessation events was modest, which likely reduced statistical precision. In the fully adjusted cessation model, depressive symptoms stood out as the strongest correlate, with a relative risk of 2.82 (95% confidence interval, 1.71 to 4.66), while current drinking was inversely associated with cessation, a finding the authors urge readers to interpret with caution.

When the researchers broke the outcome down by activity type, a more nuanced pattern emerged. Neighborhood interaction was inversely associated with cessation of community-oriented activities, which included community events, neighborhood associations, senior citizen clubs, volunteering and Silver Human Resources Center activities: the relative risks were 0.42 (95% confidence interval, 0.26 to 0.70) for sometimes and 0.24 (95% confidence interval, 0.14 to 0.42) for regularly, compared with no contact. No comparable association was seen for cessation of interest or learning-oriented activities, such as hobbies, senior college and public lectures, even though neighborhood interaction was positively associated with initiation in that domain as well, with relative risks of 1.38 (95% confidence interval, 1.11 to 1.73) for sometimes and 1.55 (95% confidence interval, 1.22 to 1.97) for regularly.

Because contact with neighbors and participation in social activities both concern social connectedness, the authors took care to address possible conceptual overlap. The source questionnaire classified contact with neighbors in a personal-activities domain, separate from the domains used to build the outcome, but the researchers acknowledge that this classification does not establish independence. In additional analyses among the same 308 baseline nonparticipants, the researchers repeated the initiation analysis using an eight-item outcome that excluded community events and neighborhood associations, the two items most closely overlapping with the exposure. The relative risks were 1.43 (95% confidence interval, 1.13 to 1.80) for sometimes and 1.43 (95% confidence interval, 1.07 to 1.92) for regularly, similar to the ten-item results. Among these nonparticipants, adjusted mean differences in the number of activities at age 70 were 0.75 (95% confidence interval, 0.31 to 1.20) for sometimes and 1.03 (95% confidence interval, 0.36 to 1.69) for regularly, and differences in the total participation score were 0.93 (95% confidence interval, 0.34 to 1.52) and 1.36 (95% confidence interval, 0.43 to 2.29), respectively. Direct contrasts between regularly and sometimes were imprecise, so the data do not establish a dose-response gradient; the clearest contrast was between the absence and presence of neighborly contact.

The authors situate their findings within the social network framework proposed by Berkman and colleagues, in which ties with neighbors may influence health behaviors and participation by providing social support, information and norms. Neighborly contact could raise awareness of local opportunities, provide informal invitations or encouragement, and lower the psychological threshold for joining new activities. The results align with earlier Japanese longitudinal work showing that older adults embedded in neighborhood or same-interest networks were more likely to start leisure activities, and that relationships with neighbors were related to new and continuous participation in public groups such as neighborhood associations and senior citizen clubs. The new study extends this literature by showing that the association holds for the initiation of social participation specifically during the transition from age 65 to 70, and by distinguishing initiation from cessation, which previous studies have often merged into overall participation levels or broad trajectories.

The authors emphasize that these are observational findings and do not establish causal effects. Both the exposure and the outcome were self-reported, neighborhood interaction was measured with a single item that did not define who counts as a neighbor or distinguish among forms of contact, and the exposure was assessed only at age 65, so changes during follow-up were not captured. Reverse causation cannot be fully excluded, because people predisposed to social engagement may also have had stronger neighborhood ties at baseline; indeed, at baseline 62 percent of participants reporting no neighborhood interaction still participated in at least one activity, indicating incomplete overlap between the measures. Residual confounding remains possible, and the study lacked objective neighborhood characteristics such as walkability, transport access and the location of community facilities, and did not measure loneliness. The cohort consisted of community-dwelling residents of one growing suburban Japanese city whose proportion of older residents remains below the national average, so the findings may not extend to depopulating rural areas or dense urban centers. The authors conclude that the results support further investigation of local social conditions related to the initiation and continuation of social participation in early old age, including studies that combine objective neighborhood measures with individual reports before any intervention implications can be determined.

Subject of Research: Longitudinal associations between neighborhood interaction at age 65 and initiation and cessation of social participation by age 70 in Japanese older adults

Article Title: Neighborhood interaction at age 65 and subsequent initiation and cessation of social participation in Japanese older adults: the NISSIN Project

Article References: Ukawa, S., Zhao, W., Okabayashi, S., Kimura, T., Shan, Y., Hao, W., Ando, M., Wakai, K., Tsushita, K., & Tamakoshi, A. (2026). Neighborhood interaction at age 65 and subsequent initiation and cessation of social participation in Japanese older adults: the NISSIN Project. Discover Aging, 1(1), Article 12. https://doi.org/10.1007/s44518-026-00012-3

Image Credits: AI Generated

DOI: 10.1007/s44518-026-00012-3

Keywords: social participation, neighborhood interaction, aging, cohort study, Japan, NISSIN Project, initiation, cessation, community activities, older adults, social networks, depressive symptoms