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Objective: The objective of this study was to adapt and validate the Vietnamese version of Active Aging Index (AAI). Method: We conducted an expert panel, focus groups, test-retest and examination of internal consistency, and construct and concurrent validity among 804 older Vietnamese adults. Results: Scale content validity index (CVI) was 0.98. Test-retest coefficients ranged from 0.70 to 1.00. The Cronbach's alphas of well-being, voluntary, affordability, and politics were 0.94, 0.70, 0.65, and 0.16, respectively. Voluntary and well-being had good construct validity. Regarding politics, only one of four items had good test-retest reliability (Kappa 0.84), while other three had low variance in both test-retest and field study. In exploratory factor analysis, items assessing affordability loaded on three components. AAI was positively associated with perceived health, life satisfaction, and quality of life; it was negatively associated with falls, loneliness, and frailty. Discussion: In adapting AAI, researchers should consider cultural sensitivity. Key modifications, findings, explanations, and suggestions are presented here.