In the context of the global fight against ageism and the promotion of higher quality aging, the World Health Organization has introduced the concept of "active aging," which serves as a key framework for shaping policies and strategies at both international and EU levels. This paper explores the impact of the quality of life of the elderly in the Republic of Croatia on the sustainability of the concept of successful aging. In the introductory section, the concept of successful aging is defined, and key factors that influence the quality of life of older adults are emphasized, such as functional ability, self-esteem, life satisfaction, depression, loneliness, and social connectedness. Additionally, the paper addresses theories and models of successful aging, highlighting the importance of social inclusion and family support in maintaining the quality of life for older individuals. The analysis of the quality of life of the elderly in Croatia covers various aspects, including health status and access to healthcare, which are crucial for maintaining a good standard of living. Social security is also explored, with particular emphasis on financial benefits, social services, and the risk of poverty, as well as psychosocial factors contributing to successful aging. The paper also analyzes prejudices and stereotypes about older individuals, including the phenomenon of ageism, and violence against the elderly as a serious issue that requires urgent attention. Finally, it examines the role of social workers in working with older adults at the micro, mezzo, and macro levels, highlighting how their engagement can positively influence the quality of life for elderly individuals. This paper contributes to a better understanding of the complexities surrounding the quality of life for the elderly in Croatia and underscores the importance of integrated approaches in the development of policies that support the sustainability of successful aging.