Purpose: As the population ages, it is critical to understand the elements that contribute to the well-being of older individuals. Prior research suggests that a better sense of mastery and purpose in life may explain at least some of the beneficial link between wisdom, religion, and subjective well-being. This current study seeks to identify a model of older persons' psychological well-being formation in a religious group. Whether psychosocial strengths such as religiosity, social support, and wisdom are directly related to psychological well-being. Self-acceptance, autonomy, positive interpersonal relationships, environmental mastery, personal growth, and a sense of life purpose are all components of psychological well-being.Participants and Methods: This cross-sectional study included 261 participants, 42 men and 219 women aged 60 and up with normal cognitive, hearing, and/or speech functions. Participants lived in The boarding house in South Tapanuli-North Sumatra, Indonesia, for over 6 months. A backward translated Likert scales is used for data collection. The data were analyzed using Structural Equation Model (SEM).Results: The results indicate that social support and religiosity have an effect on psychological well-being through wisdom as a mediator.Conclusion: These findings emphasize the relevance of internal strengths for psychological well-being and give credence to the mediated path model's applicability to older adult communities in Indonesia.