Public libraries are a key access point for community-based education for lifelong learners. Libraries link independent learners, materials, programs, and other community agencies, and provide a common touchstone for all segments of the population. The public library and its mission support lifelong learning through the acquisition and organization of materials, reference and information services, programming, and outreach. In order to provide effective service for older learners, the librarian should have a three-tiered knowledge base: (1) core knowledge of library and information science; (2) knowledge of public library service; and (3) knowledge for specialized library service to older adults. Due to weaknesses in the structures of formal education, continuing education, and dissemination mechanisms, there are gaps in the knowledge base that serves as the foundation for lifelong learning. Suggested areas of research include advocacy, structures and mechanisms for education and knowledge dissemination to service providers, and strategies and methods for planning and providing educational services to older learners. The approach to studying and planning lifelong learning opportunities should be multidisciplinary, stress continuity, underscore interrelatedness of all segments of the community, be inclusive, and emphasize access to information. Two appendices provide a statement of knowledge and skill expectations for entry level public librarians, and guidelines for library service to older adults. (Contains 15 references.) (MAS)