The Human Development Index (HDI) is a proxy for the social and economic level of countries, which is related to the health and well-being of older adults. This study aimed to examine the moderating effect of the HDI on the relationship between frailty and health-related quality of life among European older adults. Participants were 23,972 older adults (53.2% female, M = 74.2 years old, SD = 6.75 years old) from 24 European countries, joining wave 8 (2020) of the Survey of Health, Aging, and Retirement in Europe (SHARE). Multilevel modeling was used to analyze nested data. Significant differences in health-related quality of life among the several European Union countries were observed (intraclass correlation coefficient [ICC] = 0.18, LRT (1) = 5568.07, p < .001). The HDI has been shown to moderate the relationship between frailty and health-related quality of life among older adults, buffering the impact of frailty on the health-related quality of life. Since healthy aging is a priority for the European Union, policies mitigating the impact of HDI on the relationship between frailty and health-related quality of life should be implemented.

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Healthy aging,Human development index,Multilevel analysis,Older people,Public health

• Health Sciences - Medical and Health Sciences