Background: Knowledge gaps remain regarding challenges in delivering Emergency care to older adults (OA). Objective: To explore the experience of Emergency Department (ED) healthcare providers (HCPs) in providing care to OA. Methods: Being stage one of an ongoing five-year experience-based co-design project, a qualitative approach was employed, recruiting participants who were Australian registered clinicians, non-clinical staff who support clinical care or manage patient care delivery from three public hospital EDs in Sydney. Semi-structured interviews and focus groups were conducted with an interview guide. Inductive thematic analysis was employed. Results: Forty-five semi-structured interviews and one focus group were conducted with 52 participants, comprising of 44% nurses, 27% doctors, and 17% allied health providers. Five major themes were identified from the experience of HCPs: 1) characteristics of OAs, 2) systematic issues in ED, 3) intensive ED practice, 4) challenging physical environment, and 5) limited community resources. HCPs reported the challenges in delivering quality of care to OAs living with medical complexity, cognitive impairment and declining independence. These were attributed to the nature of ED practice with time constraints, intensive workload and lack of resources. The mismatch between the existing ED models of care and the needs of OAs was raised by participants. Conclusion: The development of a geriatric-friendly ED model of care is important to improve ED performance and meet the needs of OAs. It would be feasible to collaborate with ED HCPs and OAs to co-design a geriatric-specific ED model of care and deliver quality of care to OA population.