Current research has established a relationship between older adults' subjective well-being and factors extending beyond their economic status to encompass various non-monetary elements. While most studies in this domain focus on factors within a single country, our analysis utilizes international longitudinal surveys to explore older adults' well-being at both the national and global scale. This comprehensive analysis considers micro- and macro-level determinants of retirement well-being, revealing consistent variations in happiness levels across countries. Our study specifically suggests a compelling positively relationship between ago and subjective well-being within the United States. This finding presents a contrast with the negative association observed in European countries. Our global analysis further indicates a positive relationship between age and subjective well-being. This study not only contributes to greater understanding of the complexities related to aging and well-being but also provide significant implications for financial services professionals and public policymakers that aim to improve the well-being of elderly populations.