Background: The high interest in short scales to measure personality traits has created a need for psychometric studies to validate such scales in different languages and cultures. There has recently been increasing interest in the study of personality in late life. Objective: The aim of this study was to investigate the reliability and validity of the Persian version of the Ten-Item Personality Inventory (TIPI) among older Iranians. Design: In this cross-sectional, psychometric study, 160 individuals older than 60 years were selected using multi-stage and convenience sampling methods. Data were collected using the Ten-Item Personality Inventory (TIPI) and the NEO Five-Factor Inventory (NEO.FFI). The face, content, and convergent validity of the TIPI were examined, and its reliability was evaluated using Cronbach’s alpha coefficient and test-retest reliability. Results: In general, the Persian version of the TIPI had acceptable psychometric properties for measuring the Big Five personality traits in older adults in terms of test-retest reliability (ICC = .92, p = .000) and convergent validity (r = .411, p < .00). Conclusion: The results of this study demonstrate that the TIPI is a valid and reliable tool for measuring the Big Five personality traits.
