Patients with triple negative breast cancer were identified using the Surveillance, Epidemiology, and End Results database. Competing risks analysis was used to assess the cumulative incidence of breast cancer-specific mortality (BCSM). Multivariable Fine-Gray regression was used to identify predictors of BCSM. Women age 70+ (n = 4221) were less likely to receive chemotherapy and radiation treatment (P < 0.0001) and had higher BCSM compared to younger women (P < 0.0001). There were no differences in BCSM in patients who received adjuvant treatment (P = 0.10). Stage II patients derived the greatest relative and absolute benefit from adjuvant treatment. Age was not a significant predictor of BCSM.