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Simple Summary: Identification of the optimal treatment strategy is challenging in elderly with non-small cell lung cancer (NSCLC). Outcomes (1) in elderly vs. younger patients and (2) with low-dose cisplatin vs. cisplatin/vinorelbine were studied. Elderly included more males, had a lower Karnofsky index, more comorbidities, and lower stages. Low-dose cisplatin patients had higher age, more comorbidities, and lower stages. We observed reduced dermatitis and dysphagia and increased anemia and thrombocytopenia in elderly, without increased ≥grade 3 toxicities. Low-dose cisplatin was less toxic than cisplatin/vinorelbine. Survival was lower in elderly vs. younger and comparable between both chemotherapy protocols. In elderly, gender, Karnofsky index, stage, and multimodal treatment (including additional surgery/systemic therapy) were prognostic factors. In elderly, we found acceptable toxicities with radiotherapy but the need for the improvement of outcomes. Multimodal strategies showed a favorable prognosis and can reasonably be considered. Low-dose cisplatin should be discussed on an individual basis due to favorable toxicity and outcomes. Identification of the optimal treatment strategy is challenging in elderly with localized non-small cell lung cancer (NSCLC). Concurrent chemotherapy with low-dose cisplatin represents an option for elderly. Outcomes (1) in elderly (≥70 years, n = 158) vs. younger patients (n = 188) and (2), independently of age, in definitive radiochemotherapy, with low-dose cisplatin (n = 125) vs. cisplatin/vinorelbine (n = 76) were studied. Elderly included more males, had a lower Karnofsky index, more comorbidities, and lower stages. Low-dose cisplatin patients (vs. cisplatin/vinorelbine) had higher age, more comorbidities, and lower stages. We observed reduced dermatitis and dysphagia and increased anemia and thrombocytopenia in elderly vs. younger patients, without increased ≥grade 3 toxicities. Low-dose cisplatin was less toxic than cisplatin/vinorelbine. Survival outcomes were lower in elderly vs. younger and comparable between low-dose cisplatin and cisplatin/vinorelbine. In elderly, gender, Karnofsky index, stage, and multimodal treatment (including additional surgery/systemic therapy) were identified as prognostic factors. In conclusion, we found evidence for an acceptable toxicity profile and the need for improvement of outcomes in elderly with localized NSCLC. Multimodal strategies (including additional surgery/systemic treatment) showed favorable outcomes and should be reasonably considered in elderly who are deemed fit enough. Low-dose cisplatin should be discussed on an individual basis due to favorable toxicity and outcomes. [ABSTRACT FROM AUTHOR]