1. Conceptual Ambiguity and Diverse Perspectives
The World Health Organization (WHO) conceptualizes the determinants of quality of life through the contrasting perspectives of subjective and objective factors, noting that these determinants have diversified alongside historical changes and rising standards of living. Rather than adhering to a dichotomy between subjective and objective measures, quality of life is increasingly understood as a multifaceted and complex construct, making a unified definition difficult to establish. Because delineating a precise definition remains challenging, perspectives vary widely across scholarly fields:
First, it is a subjective, cognitive evaluation of objective living conditions.
Second, it is an abstract representation of the state in which one's life is improving or deteriorating.
Third, it is the extent to which individuals perceive their lives as meaningful, feel they have accomplished their primary life goals, and effectively adapt to their environment, fulfilling personal needs without experiencing emotional or social distress.
Fourth, it is a person's perceived subjective well-being across socioeconomic, physical, and psychological domains, evaluated through mental health, physical health, social interest, and responses to diagnosis and treatment.
Fifth, it is a comprehensive construct encompassing personal autonomy, physical and mental well-being, life satisfaction, socioeconomic status, cultural factors, social relationships, functional capacity, and the physical environment.
2. Theoretical Frameworks and Core Dimensions
A shared baseline among these definitions is that quality of life encapsulates how individuals perceive their existence. It can be defined as an individual's evaluation of their position in life within the context of their culture and value systems, oriented around their personal goals, expectations, and concerns. A widely recognized definition describes quality of life as an individual’s subjective evaluation of and satisfaction with their overall life circumstances and personal experiences.
One notable sociological framework posits that quality of life consists of three dimensions: having, loving, and being.
Being relates to participating in activities that shape one's life, including political involvement, leisure opportunities, meaningful work, and access to nature.
Loving centers on social relations, such as attachment to and interaction with neighborhood communities, bonds with family and relatives, active companionship, and relationships with colleagues.
Having pertains to objective, material standards of living, including economic resources, housing conditions, employment, work conditions, health, and education.
Scholars also emphasize that individuals evaluate their lives through two primary mechanisms: emotional affect and cognitive appraisal. While psychologists typically focus on individual well-being, sociologists and economists tend to concentrate on social and collective well-being. Quality of life is not an absolute constant; rather, it evolves with economic, cultural, and political conditions, as well as the prevailing values of society's members. Because individual experiences are shaped through interactions with others, quality of life is inherently subjective and normative, yet relatively defined within interpersonal relationships. It reflects how community members perceive and experience their current life circumstances, where the degree of subjective satisfaction with objective realities and the balance of positive versus negative emotions determine the quality of life.
3. Quality of Life in Later Life and Successful Aging
Quality of life encompasses both mental and material, qualitative and quantitative, and subjective and objective facets of individual and communal existence, presenting a diverse array of conceptual dimensions. Unlike in the past, when primary attention was directed toward basic survival, aspirations and concerns regarding quality of life in later years continue to grow. Interest in this area has surged as more individuals seek to satisfy higher-order needs that material wealth alone cannot fulfill. Furthermore, quality of life highlights affective self-evaluations regarding comfort, happiness, and emotional security, with concepts such as a "sense of a worthwhile life" frequently utilized in its measurement and analysis.
For older adults, quality of life directly correlates with happiness and the realization of life goals, serving as a pivotal element for successful aging. Embracing life with a sense of meaning and a positive outlook facilitates better psychological, biological, and social adaptation to environmental shifts throughout the aging process, thereby elevating quality of life. Economic stability is an indispensable prerequisite for maintaining daily subsistence, fulfilling fundamental needs, and promoting social participation—ultimately fostering greater life satisfaction and higher quality of life. Additional literature underscores quality of life as the subjective sense of well-being, happiness, satisfaction, frustration, or disappointment experienced by individuals and groups. In the context of older adults, it is a multidimensional construct encompassing economic conditions, physical and mental health, psychological happiness, and social resources, functioning as a state of subjective well-being within a supportive environment characterized by health, stability, financial security, and social recognition. Other studies define it as both subjective and objective appraisals of daily life satisfaction, self-esteem, health status, functional capacity, and socioeconomic conditions. It has also been conceptualized as a holistic framework integrating autonomy, physical and mental health, life satisfaction, socioeconomic context, cultural factors, interpersonal relationships, functional abilities, and the living environment, or alternatively as a state of satisfaction across physical, emotional, and social spheres encompassing daily functioning and lived experiences. Emphasizing the role of interpersonal networks, scholars note that quality of life is inextricably linked to social relationships, as human beings exist dynamically within social contexts. Moreover, quality of life must be evaluated from a relativistic perspective—not as an absolute metric immune to time and place, but based on how individuals interpret and navigate shifting environmental conditions according to societal values and cultural norms. 4. Conclusion Synthesizing these varied perspectives reveals that quality of life among older adults is a multifaceted construct where social roles, physical functioning, financial status, and subjective happiness are deeply intertwined with environmental conditions. Broadly speaking, it signifies an individual’s overall level of satisfaction rooted in both objective circumstances and subjective self-appraisals, underscoring the imperative to understand its diverse dimensions and empower individuals to actively cultivate and enhance their own quality of life.