Introduction: Chronic kidney disease (CKD) affects people across their lifespan. Kidney supportive care (KSC) is typically offered for older people for symptom management, education, and/or advance care planning (ACP). However, younger people may also benefit from KSC. This study sought to explore characteristics of working-age adults with CKD accessing KSC. Methods: Using a cross-sectional design, working-age adults (18–64 years) with CKD referred to a KSC service from February 2016 to July 2021 were included. Demographic and clinical data were extracted from patients’ hospital records. Self-reported symptoms (Integrated Palliative Care Outcome Scale renal [IPOS-renal]) and health-related quality of life (European quality of life [EQ-5D-5L]) were assessed. Reasons for referral to KSC, kidney replacement therapy (KRT) pathway at referral, and comorbidity calculated using the Charlson Comorbidity Index were also assessed. Results: One Hundred Fifty-six working-age adults attended the KSC service. Median age was 57 years, with more than half receiving KRT. Weakness (92.2%), poor mobility (83.3%), and pain (82.5%) were the most prevalent and severe symptoms. The majority were referred for symptom management (n = 83, 53.2%) and 27% for ACP (n = 42). The ACP completion rate was low (28.9%). Those on dialysis had significantly higher symptom scores than those not receiving dialysis (p < 0.05). Conclusion: Working-age adults with CKD experience a significant and debilitating symptom burden and need to consider options for treatment. This study provides new understanding about working-age adults with CKD that may help provide the specific support needed to meet their end-of-life care needs.