The paper presents a comprehensive overview and analysis of 65 theoretical models/definitions of healthy ageing and finds that the most widely used terms in these conceptualizations are “successful” and “healthy”. The three types of models that emerged highlight the multidimensionality of healthy ageing that goes beyond the cognitive, physical, and psychological to include social, environmental, spiritual, and economic dimensions among others. Life-long person-environment interactions and congruence with the living environment, adaptations to losses and gains, health outcomes, and health promotion/empowerment are quintessential in defining Healthy Ageing. The paper discusses that a monistic definition of healthy ageing, even if desired, would be practically challenging in adapting it to different populations and contexts.
