INTRODUCTION: Older cancer survivors consistently express the need for interventions to reduce cancer-related fatigue (CRF) and maintain quality of life (QOL). Yoga is a promising treatment to address CRF and QOL. However, research comparing the efficacy of yoga for improving fatigue and QOL in older survivors (60+) vs. younger adult survivors (≤59)is limited. Our objective was to examine the effects of yoga on CRF and QOL in older survivors vs. younger survivors. MATERIALS AND METHODS: We conducted a secondary analysis of a nationwide, multicenter, phase 3 randomized controlled trial. For this study, participants who provided evaluable pre- and post-intervention data on the Functional Assessment for Chronic Illness Therapy-Fatigue (FACIT-F) and the Functional Assessment for Cancer Therapy-General (FACT-G) were eligible. The yoga intervention comprises gentle Hatha and Restorative Yoga and includes breathing exercises, physical alignment postures, and mindfulness. RESULTS: Of the 177 participants included in the study, 30.1 % were aged 60+ and 69.9 % were aged ≤59. More younger participants had breast cancer (82.0 % vs. 59.2 %. p = 0.009), surgery (98.9 % vs. 77.8 %, p < 0.001), and chemotherapy (80.5 % vs. 55.6 %, p = 0.001). There were no differences in the cancer stage (66.1 % stage I or II). There were statistically significant and clinically meaningful within-group improvements from baseline to post-intervention in CRF for participants aged ≤59 and participants aged 60+ (4.0 ± 0.7, p < 0.001 vs. 3.1 ± 1.0, p = 0.003). Both age groups also demonstrated improvements in QOL (3.2 ± 0.8, p < 0.001 vs. 2.1 ± 1.2, p = 0.078), physical (1.6 ± 0.3, p < 0.001 vs. 0.8 ± 0.5, p = 0.084), functional (0.7 ± 0.3, p = 0.048 vs. 1.0 ± 0.5, p = 0.037), and emotional well-being. There were no significant between-group differences between the age groups. Most younger and older participants reported that yoga helped improve their sleep quality (92.8 % vs 88.5 %) and they would recommend it to other survivors (98.2 % vs 90.4 %). DISCUSSION: Older cancer survivors who undergo gentle Hatha and restorative yoga performed two to three times per week for four weeks at a low to moderate level of intensity have similar improvements in CRF and QOL compared to participants aged ≤59. For older survivors experiencing these toxicities, it is reasonable for clinicians to prescribe yoga. CLINICALTRIALS: govidentifier: NCT00397930.