Introduction: Peritoneal carcinomatosis presents significant treatment challenges. Cytoreductive surgery (CRS) with hyperthermic intraperitoneal chemotherapy (HIPEC) offers a promising therapeutic approach. Patient selection remains critical, and the role of age as an exclusion criterion requires further investigation. This study evaluates whether age influences postoperative outcomes in CRS-HIPEC patients. Methods: A retrospective review of a prospective comprehensive database of 271 CRS-HIPEC procedures performed between 2018 and 2023 was conducted. Logistic regression assessed the relationship between age and postoperative outcomes. Age groups (18–44, 45–69, ≥70 years) were compared based on demographic data, primary tumor site, Peritoneal Cancer Index scores, and key outcome measures. Results: Across the different age groups, there were no significant differences in PCI scores, recurrence, disease-free survival, 30-day morbidity, or mortality. Length of stay was longer in older patients (p = 0.009). Patients aged ≥70 had higher readmission rates (p = 0.041) and were more often discharged to transitional care facilities (p = 0.001). Older patients were also more likely to experience Clavien–Dindo grade III or higher complications (p = 0.008). Logistic regression confirmed these findings. Continuous age analysis yielded similar results and revealed significant differences in race and primary organ involvement. Conclusions: Age is not a significant predictor of 30-day morbidity, mortality, or survival outcomes in patients undergoing CRS-HIPEC. However, older patients require closer attention to discharge planning and readmission risk management. This study highlights the importance of comprehensive patient assessment beyond age and underscores the need for further research to better understand factors influencing outcomes in this population.
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