Personality Traits Influence Frailty in Older Adults through Health Behaviours and Psychosocial Resources

Background Frailty is a critical public health issue in aging populations, linked to increased disability, hospitalization, and mortality. While biological and clinical risk factors are well established, less is known about how psychological traits, particularly personality, influence frailty development and ‘get outside the skin’ to affect health. Methods Using data from Wave 3 (2014–2015) of The Irish Longitudinal Study on Ageing (TILDA), we examined associations between the Big Five personality traits and frailty among 2,146 community-dwelling older adults. Personality was assessed with the 60-item NEO-FFI-R. Frailty was measured both subjectively (self-reported deficits) and objectively with clinical and functional indicators matched to the subjective items to minimize reporting bias. Mediation analyses explored psychosocial and behavioral pathways, including stress, social support, resilience, smoking, and body composition. Results Neuroticism was consistently associated with higher frailty, especially on the subjective index. In contrast, openness and extraversion were linked to lower objective frailty. Perceived stress emerged as the strongest mediator of the neuroticism–frailty link, followed by WHR and smoking. For openness, resilience and WHR contributed modestly to its protective effect; extraversion’s benefit was primarily mediated by social support. Distinct mediation patterns emerged across personality traits and frailty types, underscoring the complexity of these relationships. Conclusion Personality traits, particularly neuroticism, openness, and extraversion, are meaningfully related to frailty via psychological and behavioral mechanisms. Findings support the integration of psychosocial resources into frailty prevention and healthy aging strategies.