Introduction: Well-being is an important construct whose associated determinants must be identified in order to further understand the processes for healthy aging. The study of the impact of frailty on older people’s wellbeing requires the incorporation of physical, psychological and social domains. Hence, frail older adults can be defined from physical frailty, together with loneliness as social frailty. This study proposes a model to study the impact of frailty and loneliness on well-being of older adults, differentiating among control, autonomy, pleasure and self-realization. Method: A cross-sectional study was carried out with a sample of 13569 older adults from the SHARE project was employed in order to estimate a structural equation model in which frailty and loneliness affected well-being (CASP questionnaire), while controlling for gender, age and perceived health. Results: The final model additionally contemplated the effect of gender on the grip strength frailty indicator. Results showed a good fit of the model to the data and could explain 80.1% of the variance of control, 48.6% of autonomy’s, 43.6% of pleasure’s and 61.3% of the variance of self-realization. Conclusions: Loneliness and frailty showed differential effects on the different components of well-being. Implications of these effects on intervention development are discussed.

Keywords:
Well-being, successful aging, physical factors, psychosocial factors, older adults

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