Low health literacy (HL) affects approximately two-thirds of adults aged over 60, contributing to communication barriers and poorer outcomes in primary healthcare. Primary healthcare providers (PHCPs) are well placed to address HL through effective communication, yet training in HL-focused communication competencies remains inconsistent and insufficiently standardised. This study aimed to co-design and validate a communication training program to strengthen HL-focused competencies among PHCPs working with older adults. Phase 2 applied an Experience-Based Co-Design approach involving older adult consumers and PHCPs across three structured workshops to identify and prioritise communication needs and training preferences. Phase 3 (in progress) uses a three-round Delphi study with a national expert panel, including providers and consumers, to establish consensus on the importance, feasibility, and appropriateness of the identified competencies for Australian primary care. Co-design participants (n=7) identified nine core communication competencies spanning knowledge, skills, and attitudes, grouped into three modules: Foundations of Communication, Patient-Centred Dialogue, and Complex Clinical Conversations. The prototype integrates flexible delivery formats, combining online learning with in-person simulation. Early findings highlight the importance of relational communication skills, including active listening, tailoring information, and supporting autonomy. The Delphi study will refine and validate these competencies to produce a consensus-based, contextually grounded framework. This study demonstrates a novel generate-then-validate approach to workforce development. The resulting training model offers a scalable pathway to improve communication, patient engagement, and health outcomes for older adults in primary care.