The Health & Aging Brain Study (R01AG054073) is a 12 million dollar study funded by the National Institute of Aging. The goal is to study pathways for MCI and AD among Mexican Americans and non-Hispanic whites, and define subtle neuroanatomical and blood-based biomarker changes that are related to future risk of MCI and AD. This study contains 2 assessments (baseline and 24 month follow-up). Each assessment contains 5 components: interview/neuropsychological testing, blood draw, research medical exam, informant interview, and magnetic resonance imaging (MRI). For more information please contact the study team at 817-735-2963.