Background: Intergenerational communication has been recognized as a key factor in enhancing social connections among older adults by improving the quality of interactions, which is a crucial component of healthy aging. However, effective interventions to foster intergenerational communication and engagement remain scarce at this stage. Objective: This study examined the effects of a gamification intervention for intergenerational dialogue on intergenerational communication and health-related capacity across 3 age cohorts and further analyzed the differential impacts of intervention characteristics on the game experience, in terms of satisfaction and engagement. Methods: A 2-stage exploratory method was adopted with a cocreation approach to develop a theoretical framework of intergenerational dialogue for the gamification-based intervention, the Healthy Aging in Dialogue Tabletop Game, followed by a mixed methods study involving pre- and postintervention surveys and qualitative interviews to evaluate the effectiveness of the intervention in the young (aged 18‐39 years), middle-aged (aged 40‐64 years), and older adult (aged ≥65 years) groups. Intergenerational communication was assessed using tools measuring satisfaction and competence, whereas health-related capacity was evaluated using health literacy and patient enablement tools. Results: A total of 68 respondents completed the intervention and evaluation, with 23, 14, and 31 respondents in the young, middle-aged, and older adult groups, respectively. This intergenerational intervention yielded notable benefits in intergenerational communication satisfaction (Cohen =0.745), communication competence (Cohen =0.377), and health literacy (Cohen =0.409), especially among older adults. Patient enablement was significantly higher in older adults (mean score 6.10, SD 2.18) than in young adults (mean score 4.22) (=.04). In addition, this study highlighted the importance of leveraging gamification to enhance intergenerational communication and engagement, ultimately combating social isolation among older adults. Conclusions: The intergenerational dialogue tabletop game provided an enjoyable platform for cross-generational dialogue and enhanced each age group’s communication competence, allowing participants to contribute and learn from one another. The findings provide additional evidence for aging research and shed light on approaches to foster social interaction and connection, thereby promoting health and active aging.

Background: Social isolation and weakened intergenerational ties pose significant threats to the emotional well-being and social support networks of older adults. Although structured intergenerational programs can reduce age-related stereotypes and promote connectedness, their accessibility is often hindered by physical and logistical constraints. The increasing digital literacy among older populations presents new opportunities for technology-based interventions to support meaningful cross-generational engagement. Objective: This study aimed to design and evaluate a mobile app that fosters intergenerational communication and enhances perceived social support in older adults using a user-centered design framework grounded in the double diamond model. Methods: The development process followed the 4 phases of the double diamond model. In the discover phase, surveys with older and younger adults identified distinct usability preferences. The define phase synthesized these insights into key design principles. In the develop phase, a prototype was created and iteratively refined through usability testing. Finally, in the deliver phase, a 2-week experimental study involving 39 participants (20 older adults aged 68-82 years and 19 younger adults aged 22-39 years) assessed changes in intergenerational interaction, perceived social support, and user satisfaction. Results: The app appeared to enhance intergenerational communication and perceived social support, particularly among older participants. Users reported increased comfort and emotional connection in cross-generational conversations. Accessibility features and engaging content were noted as contributing to positive user experiences across age groups. Conclusions: This study suggests the potential of user-centered digital platforms to promote social well-being among older adults. By addressing the unique needs of multiple generations, such interventions may help foster inclusive digital environments and contribute to age-friendly, connected societies. Despite limitations related to sample size, duration, and cultural context, the study provides preliminary evidence for the potential of co-designed digital tools in supporting intergenerational communication and aging-in-place.