High rates of obesity and prediabetes among older adults pose a substantial personal and societal burden. Among U.S. adults age 60 and older, 35% have obesity and 50% have prediabetes, placing them at substantial risk for diabetes, cardiovascular disease, certain types of cancer, and impaired mobility, as well as significantly elevated health care costs. Implementation of a practical and effective diabetes prevention program at the population level could have major public health benefits and could also save costs.