Background: Older adults represent the largest population group in general practice, despite this, gerontology remains underdeveloped as a specialism within Australian practice nursing. The role of practice nurses is often driven by funding, such as health checks, care planning and immunisation. This can limit opportunities to deliver evidenced-based health promotion for older populations. Aim: To evaluate the impact of the Gerontological Nursing Competencies (GNC) educational intervention on practice nursing in New South Wales, specifically for developing gerontological specialisation. Method: A case study of a six-month education intervention for practice nurses (n=8). The intervention consisted of virtual workshops, online learning, and mentoring by gerontological nurses (n=3). Data will be interviews (practice nurses, mentors and Primary Health Network representatives), short written responses (practice managers), pre and post competency self-assessments and portfolios of evidence demonstrating practice nurse competence. Thematic analysis will be adopted to generate the findings. Results: Preliminary findings suggest that the GNC intervention provides a structured pathway for practice nurses to develop gerontological expertise across clinical assessment, health promotion, and person-centred care. The professional growth of the practice nurses enabled them to extend their existing scope of practice. The barriers and enablers for implementing this education intervention will also be identified. Conclusion: This study addressed a significant gap in Australian practice nursing. Embedding gerontological nursing competencies into professional development for practice nurses offers a replicable, policy aligned model to improve the health of older adults. Future research could explore the application of advanced gerontological competencies for nurse practitioners in general practice.