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To compare how structural MRI, Fluorodeoxyglucose (FDG), and Flortaucipir (FTP) PET signal predict cognitive decline in high-amyloid versus low-amyloid participants with the goal of determining which biomarker combination would result in the highest increase of statistical power for prevention trials. In this prospective cohort study, we analyzed data from clinically-normal adults from the Harvard Aging Brain Study with MRI, FDG, FTP, and PiB-PET acquired within a year, and prospective cognitive evaluations over a mean three-year follow-