Background: SUNLIGHT, an international, open-label, randomized, phase 3 study comparing trifluridine/tipiracil (FTD/TPI) + bevacizumab (FTD/TPI + bev) to FTD/TPI monotherapy in patients with refractory metastatic colorectal cancer (mCRC), demonstrated a 3.3-month increase in overall survival from 7.5 months with FTD/TPI monotherapy to 10.8 months with FTD/TPI + bev (HR, 0.61; 95% CI: 0.49–0.77; P<0.001). This subgroup analysis of SUNLIGHT examined efficacy and safety outcomes by age. Methods: In SUNLIGHT, patients with mCRC with ECOG PS of 0-1 and two prior treatment regimens were randomized to receive FTD/TPI + bev or FTD/TPI. A subgroup analysis was performed to evaluate efficacy and safety outcomes in patients aged <65, 65-74, and ≥75 years. Results: Among 492 randomized patients (n=246 FTD/TPI + bev; n=246 FTD/TPI), 56%, 32%, and 12% were aged <65, 65-74, and ≥75 years, respectively. Concerning overall survival, hazard ratios for FTD/TPI + bev vs FTD/TPI monotherapy were 0.65 (95% CI: 0.48–0.87), 0.64 (95% CI: 0.43–0.94), and 0.49 (95% CI: 0.27–0.90) in patients aged <65, 65-74, and ≥75 years, respectively. Regardless of age, patients receiving FTD/TPI + bev experienced improved progression-free survival and improved time to worsening of ECOG PS to ≥2. Among FTD/TPI + bev treated patients, frequency of any-cause severe adverse events (AEs) was slightly higher in the 65-74 subgroup [69% (<65); 80% (65-74); 67% (≥75 years)]. Frequency of grade 3 and 4 neutropenia was also slightly higher in the 65-74 subgroup [38% (<65); 54% (65-74); 42% (≥75 years)]. AE-related discontinuation rates were similar across age subgroups [11.6% (<65 years), 13.2% (65-74), and 16.7% (≥75 years)]. Conclusions: The results of this subgroup analysis demonstrate the efficacy benefit and tolerability of FTD/TPI + bevacizumab treatment regardless of age in refractory mCRC patients. Clinical trial information: NCT04737187.