Korean adolescents experience considerable stress because of an educational system that focuses primarily on college entrance examinations, pressure for academic achievement, and a competitive atmosphere in school. The main purpose of this study was to explore age differences in the construct of Korean adolescents’ academic burnout. Once assumptions of configural, factor loading, and intercept invariance were satisfied, we compared means of latent variables (four components of academic burnout in the present study). Results of the latent mean analysis showed that all four subscales (exhaustion, antipathy, cynicism, and inefficacy) of academic burnout increased gradually as age increased. Moving from elementary to middle and middle to high school appears to be stressful for students. Implications for school professionals and recommendations for future research are discussed.