Aim To utilise linked aged care and health data from AIHW’s National Aged Care Data Asset to examine patterns of health service use for older Australians from 2021-22 to 2023-24. Methods The study population included three groups aged 65 and over: (1) people living in permanent residential care, (2) people receiving a Home Care Package, and (3) an age-sex matched comparison group who did not use any aged care services. Analyses were undertaken for each group on Medicare-subsidised services, prescription medicines dispensed under the Pharmaceutical/Repatriation Pharmaceutical Benefits Scheme, hospital admissions, and emergency department (ED) presentations. Results Nearly all people living in residential care (96-97%) or using home care (98-99%) had at least one Medicare-subsidised GP attendance in each year of the study. In 2023-24, people in residential care had much lower rates of specialist attendances (3.7 attendances per person-year) compared to those using home care (6.6 attendances). Rates of antipsychotic and benzodiazepine dispensing were higher in residential care (2.2 and 1.8 prescriptions dispensed per person-year, respectively) than in home care (0.5 and 1.0 prescriptions dispensed). A greater proportion of people using home care had at least one hospital admission and ED presentation (52% and 45%, respectively) compared to those in residential care (43% and 43%) or not using aged care (24% and 18%). Between 2021-22 and 2023-24, health service use was relatively stable for each group. Conclusion The National Aged Care Data Asset is a powerful national resource to monitor health care and outcomes for older Australians. Reference www.gen-agedcaredata.gov.au/topics/interfaces-between-the-aged-care-and-health-systems