Uncovering the Dynamic System Driving Older Adults' Vitality: A Causal Loop Diagram Co-Created With Dutch Older Adults.

Background: Most studies on older adults' vitality focus on linear connections between determinants and outcomes. To design more comprehensive and impactful approaches to support the vitality of older adults, a better understanding of the interplay among elements that shape their vitality is necessary.

Objective: To uncover the underlying dynamic system that drives vitality in older adults, drawing directly from older adults' perspectives.

Methods: During three group model-building sessions with 10-12 older adults (≥ 55 years old), a causal loop diagram with relevant feedback loops was developed through co-creation with older adults. The construction and analysis of the causal loop diagram were facilitated using the online modelling tools Vensim and Kumu. The group model-building sessions were guided by Scriptapedia, an online guide to conducting group model-building practices.

Results: The final CLD consisted of 15 elements contributing to older adults' vitality, organised into three themes: 'Psychological and emotional elements', 'Social connections and support' and 'Lifestyle and habits'. A total of 41 reinforcing feedback loops were identified, with 21 involving all three themes, 15 connecting two themes and 5 within a single theme.

Conclusions: This study displays the complex interplay of elements influencing older adults' vitality, highlighting the critical roles of psychological, social and lifestyle-related elements. The participatory-led approach yielded co-produced insights that inform public health strategies, underscoring the need for comprehensive, multidisciplinary approaches to promote older adults' vitality. Such approaches must offer social opportunities and foster individuals' capacity and motivation to engage in meaningful social relationships.

Patient Or Public Contribution: The study was conducted in collaboration with a municipal policymaker and a coordinator of local community centres, who provided input on participant recruitment, materials, data interpretation, ethical considerations and result dissemination. During data collection, twelve older adults participated in three group model-building sessions, collaboratively developing a causal loop diagram to explore elements of vitality and their interconnections. Ongoing member checking with participants throughout the process ensured the analysis was refined and the researchers' interpretations were validated.