The purpose of this study was to examine the moderated mediation effect of a growth mindset on the relationships among participation in lifelong education, political efficacy, citizenship, and quality of life in adults. For analysis, SPSS Win.25.0 and PROCESS macro 3.5 were used, and frequency analysis, reliability analysis, correlation analysis and moderated mediation effect analysis were applied. The findings of this study are as follows: First, Pearson's correlation analysis indicated that there was a statistically significant positive correlation between participation in lifelong education, political efficacy, citizenship, growth mindset, and quality of life.