This study aimed to determine the educational needs of members of the public and related professional disciplines in order to improve health literacy in elderly issues. A cross-sectional survey was conducted in 2007; 2,694 subjects were recruited from the noninstitutional Hong Kong population aged 16 years and over. Undergraduate students of health care professions, professionals working at the hospitals, and the seniors were purposefully over-sampled. Results showed significant knowledge gaps and misconceptions. The gaps were more prevalent with increasing age in general, although they also existed among health care professionals. Public education should target the revealed areas of knowledge gaps and misconceptions. (Contains 2 tables.)