The Role of Well-Being, Spirituality, and Religiosity for Successful Aging in Late Life: A Brief Review

Much research has highlighted the aging process as a global, multi-faceted issue, focusing on modifiable factors that can improve physical health and psychosocial well-being in late life. This is particularly true for both developed and developing countries, which are likely to face long-term issues in health and psychosocial care as the aging of their population increases. Within the theoretical framework of successful aging and developmental psychology, this paper aims to review recent advances in our knowledge of middle and late-life well-being in order to better understand the role of well-being and spirituality/religiosity across adulthood. The results of the selected studies allow us to conclude that subjective, hedonic, and eudemonic well-being and religious practices are significant determinants shaping the overall psychological well-being, life satisfaction, and social functioning of the older population. Limitations and implications of the study will also be dis-cussed.

DOI: 10.4236/aar.2020. 92003 24 Advances in Aging Research consequences in terms of health care needs and economic costs.
The aging process involves the dynamic interaction of a range of biological, psychological, social, and economic changes that together impact outcomes in later life. Some of the major challenges often associated with aging include increasing physical limitations [2] risk of social isolation [3], and economic hardship related to decreased ability to earn income. Older adults who lack the resources to deal effectively with these challenges are often at risk for depression and other negative mental health outcomes [4].
In spite of these challenges, gerontological research in recent decades has emphasized the ways in which successful aging can be achieved, leading to positive functioning and happiness in late life. Successful aging and well-being across adulthood have become a key topic of research as the literature has highlighted the relationship of well-being with several positive life outcomes and lower rates of mortality [5] [6]. Although good health and the absence of illness and disability have been determined to be important predictors of well-being [7], various studies have shown that subjective and spiritual well-being is affected by many other variables. These include indicators of social and economic status such as income, education, marital status, social support, and religious involvement (e.g., church attendance), as well as certain well-known psychological characteristics, personality traits and a sense of coherence [8].
Contrary to the negative myths that relate aging with declines in well-being, Carstensen and colleagues [9] suggest that older adulthood is a period of development where the well-being outcomes and emotional regulation of the elderly are improving compared to the middle-life because older adults tend to focus particularly on emotionally positive situations. Furthermore, a growing body of research reveals that involvement in religious activities affects spiritual well-being and may improve the elderly's overall psychological well-being and the way that they judge their life satisfaction [10].
Therefore, this review aims to summarize the current literature on the role of well-being and spirituality/religiosity in shaping the construct of the overall satisfaction or happiness with life, revealing the strong influence of these determinants on the successful aging of older adults. This paper begins with an introduction, followed by two basic themes of the field of successful aging: a) the role of well-being, including the subjective, hedonic, and eudemonic constructs, and b) the role of spirituality and religiosity.

Method for Locating Articles and Selection Criteria
An electronic search of English language peer-reviewed empirical and review articles, as well as books (or book chapters), was conducted covering articles from ulations from middle to older adulthood. Non-English articles, book reviews, dissertations, monographs, and letters to the editor were excluded from consideration (n = 24). Finally, this procedure provided 41 sources (which is included in the reference list) focusing specifically on the field, and included 37 articles from 31 journals plus 3 books and 1 working paper. Using a content analysis methodology, the selected articles were categorized into two separate thematic areas, which included (a) the role of well-being and (b) the role of religiosity and spirituality. These thematic areas emerged from the literature that was found important and feasible to study and they represent relevant aspects of successful aging.

Theme I: The Role of Well-Being
Well-being can be conceptualized as encompassing not only the absence of physical and mental health problems, but also a subjective sense of happiness comprising a cognitive and an affective component [11]. Particularly in late life, it is this subjective sense of the quality of life that often has the largest impact on how one functions and sees one's life [12]. According to Kahneman, Diener, and Schwarz [13], subjective well-being has a sense of life evaluation; hedonic well-being refers to everyday feelings such as the experience of happiness, anger, or grief; and eudemonic well-being focuses on individuals' judgments about the meaning and purpose of their life.
From the perspective of developmental psychology, older adulthood is marked by the need to develop a sense of meaning and purpose in life, as well as a need for a sense of generativity, or of having passed along something important to the next generation [14]. A sense of meaning and purpose can be useful in buffering the effects of existential anxiety, which can become more salient in late life as growing physical limitations and the loss of loved ones cause older adults to think more about their own mortality [15]. Numerous studies have found that experiencing meaning and purpose in life is closely related to a wide range of positive well-being outcomes [ well-being may improve [24], verifying previous findings of a U-shaped relationship between age and well-being, with greater well-being at younger and older ages and lower well-being scores at middle life [25]. Although gerontological research has tended to accept this finding as standard for all populations across the world, a number of studies both from developed and developing countries have found well-being to decline with age [26], particularly for hedonic experiences [7]. In addition, literature on successful aging has accumulated evidence of gender gaps in the associations between education, income, marital status, and well-being, indicating that men tend to present higher outcomes on well-being and happiness with life than women [27], and that marriage is not always a stable predictor of satisfaction with life across adulthood [28], particularly for men [29]. These findings can be explained by the fact that men tend to be more highly educated and earn higher incomes than women, which may contribute to their well-being.

Theme II: The Role of Religion and Spirituality
One important element of well-being in older adulthood involves the role of religious belief and involvement. Religion can be conceptualized as a complex and multifaceted phenomenon involving elements of belief, behavior, community involvement, and social identity [30]. On the other hand, spirituality can be viewed as the search for interconnectedness with humanity and a personal need for connection with a higher power that can occur in and/or outside of a formal religious context [10]. A very large number of studies have found a relationship of religious and spiritual involvement with better psychological and health outcomes [31], with these effects often appearing more pronounced in later life [32]. However, large cross-cultural variations in this relationship have also been found with respect to this set of associations, with religious involvement appearing to have no impact or even a deleterious relationship with well-being outcomes in some contexts [33]. This can be explained by the fact that the relationship between religiosity and well-being is moderated by culture, meaning that the predictive value of religiosity on well-being has been found to be lower in the context of studies with atheist samples [34].
One reason that religion may be especially important in influencing well-being in late life in comparison to other life stages is that it often has direct implications both for promoting a sense of existential meaning in life and for developing strong social ties, which are both critical for late-life well-being. The meaning-making functions of religion are well-established in the literature [35] and operate in at least two ways. First, religious groups provide their members with specific tenets that help to answer their existential questions explicitly [36].
Second, belonging to a religious group involves interacting with a community of people who share the same existential belief system, providing a sense of consensus that serves to reinforce certainty in that system of beliefs [37]. The existential functions of religion impact well-being in part by reducing anxiety and the risk of depression [38]. Religious beliefs also provide the basis for a number of unique psychological coping mechanisms (such as prayer) that can provide benefits to well-being [39], and contribute to positive emotions and the use of appropriate strategies to regulate one's emotions.
From a social perspective, religious involvement serves to provide older adults with a network of social connections that can be beneficial by providing emotional support and other socially-mediated benefits [40]. Religious groups may be especially beneficial to the development of these social connections, because they are one of the few social institutions to bring together members from across the spectrum of age ranges [41]. This gives members the opportunity to develop close social relationships that may last for decades and to play the role of an elder in cross-generational relationships.

Limitations
Although its findings are interesting and significant, this review also has several limitations. First, the self-reported outcomes of the well-being of the very old   [6]. Furthermore, the review of the selected studies supports the notion that psychological well-being is also moderated by other key social and demographic predictors, such as gender, income, education, and marital status [8]. Various studies around the world have verified that good health and functioning, higher income, and greater educational levels as well as being male are factors associated with positive well-being and successful aging. Among the key variables, physical health has been widely found to be related to greater well-being, while at the same time well-being may be a protective factor in maintaining better health [7]. Finally, this paper confirmed a dichotomy in the literature of studies, mostly from English-speaking countries, reporting that as people age their well-being tends to improve compared to middle-life [9], and other studies suggesting a U-shaped relationship between life satisfaction and age does not exist across all populations and contexts, particularly for countries in transition and sub-Saharan countries [8].

Summary and Conclusions
Given the diversity of aging experiences across the globe, government agencies, policy makers, and mental health providers should consider the implications of these findings to identify the major issues that the most vulnerable aged people face. Furthermore, psychologists, gerontologists, and clinicians working with aged populations must be aware of the role that well-being, spirituality, religiosity, and other socio-demographic variables play as burdens or contributors in order to implement developmentally appropriate interventions to foster psychological well-being in late life.