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After adjustment for stage, use of concomitant chemotherapy and Charlson comorbidity scale, age was not a significant prognostic factor for event-free survival and overall survival. Regarding toxicity, after adjusting stage, the use of concomitant chemotherapy and Charlson comorbidity scale, the odds ratios for age against Grade 3 or 4 neutropenia was 0.15 (95%CI: 0.042-0.498; p>0.01) but there was no significant difference observed in anemia, pneumonia, and dermatitis. Conclusion: The patients 80 years or older showed lower acute toxicity and similar overall and event-free survival in this study. Curative lung radiotherapy could be an effective and safe treatment for patients 80 years and older.