A comprehensive survey of 3,034 Singaporeans reveals a striking knowledge gap in healthy longevity concepts. While 82.3% correctly defined lifespan as total years lived, only 41.3% accurately understood healthspan—the years spent in good health. Just over half (55.5%) expressed interest in Healthy Longevity Medicine clinics. This disparity illuminates a critical blind spot in public health literacy that could undermine efforts to extend both lifespan and quality of life. The healthspan concept represents a paradigm shift from merely prolonging life to optimizing years lived free from disease and disability. Without widespread understanding of this distinction, individuals may focus solely on longevity without considering functional independence and vitality. The finding that higher education, income, and proactive health behaviors correlate with better healthspan knowledge suggests current information reaches primarily privileged demographics. This creates equity concerns as longevity interventions advance. The relatively modest interest in specialized longevity medicine clinics, despite growing scientific breakthroughs in aging research, indicates significant educational barriers remain. Effective public health campaigns must bridge this knowledge gap to democratize healthy aging strategies and ensure longevity medicine benefits reach diverse populations rather than becoming another privilege of the affluent.