en تخصصي Special پژوهشي Research <div style="text-align: justify;"><span style="font-size:12pt"><span style="text-justify:inter-ideograph"><span new="" roman="" style="font-family:" times=""><b><span style="font-size:9.5pt"><span style="letter-spacing:.2pt">Introduction:</span></span></b> <span style="font-size:9.5pt"><span style="letter-spacing:.2pt">The present study aimed to propose a structural model of psychological well-being among older adults based on the components of loneliness, death thought, and rumination, with a focus on the mediating role of spiritual intelligence.</span></span></span></span></span><br> <span style="font-size:12pt"><span style="text-justify:inter-ideograph"><span new="" roman="" style="font-family:" times=""><b><span style="font-size:9.5pt"><span style="letter-spacing:.2pt">Methods:</span></span></b> <span style="font-size:9.5pt"><span style="letter-spacing:.2pt">This research employed a descriptive, quantitative, and correlational design using structural equation modeling. The statistical population included all older adults in the city of Khoy in 2025, from which 200 participants were selected through purposive sampling. Data were collected using the</span></span> <span style="font-size:9.5pt"><span style="letter-spacing:.2pt">UCLA Loneliness Scale (Version 3), Ryff&rsquo;s Psychological Well-Being Scale &ndash; Short Form (RPWB-SF), Death Thought Questionnaire (DTQ), Ruminative Response Scale (RRS), Spiritual Intelligence Self-Report Inventory (SISRI). Data analysis was conducted through structural equation modeling and bootstrapping techniques using SmartPLS software.</span></span><span style="font-size:13.0pt"></span></span></span></span><br> <span style="font-size:12pt"><span style="text-justify:inter-ideograph"><span new="" roman="" style="font-family:" times=""><b><span style="font-size:9.5pt"><span style="letter-spacing:.2pt">Results:</span></span></b> <span style="font-size:9.5pt"><span style="letter-spacing:.2pt">The findings indicated that loneliness (&beta; = -0.40), rumination (&beta; = -0.38), and death thought (&beta; = -0.30) had significant negative effects on psychological well-being in older adults. Conversely, spiritual intelligence (&beta; = 0.50) exerted both direct and indirect positive effects by mitigating the negative impacts of loneliness (&beta; = -0.10), rumination (&beta; = -0.13), and death thought (&beta; = -0.11) on psychological well-being.</span></span><span style="font-size:13.0pt"></span></span></span></span><br> <span style="font-size:12pt"><span style="text-justify:inter-ideograph"><span new="" roman="" style="font-family:" times=""><b><span style="font-size:9.5pt"><span style="letter-spacing:.2pt">Conclusion</span></span></b><span style="font-size:9.5pt"><span style="letter-spacing:.2pt">: These results highlight the protective role of spiritual intelligence against factors that threaten psychological well-being in older adults. Overall, the findings suggest that strengthening spiritual intelligence may serve as an effective strategy to reduce the adverse effects of loneliness, death thought, and rumination, thereby enhancing psychological well-being in this population.</span></span><span style="font-size:13.0pt"></span></span></span></span><br> <br> <br> &nbsp;</div> Loneliness, Psychological Health, Aged, Rumination, Spiritual Intelligence 118 126 http://ehj.ssu.ac.ir/browse.php?a_code=A-10-487-2&slc_lang=en&sid=1 Masoud Qorbanalipour masoudqorbanalipour@gmail.com https://orcid.org/0000-0002-7752-1969 Yes Department of Psychology, Khoy Branch, Islamic Azad University, Khoy, Iran Mahdiyeh Mahjoub mahdiye.mahjoub@gmail.com No Department of Psychology, Khoy Branch, Islamic Azad University, Khoy, Iran