age-related dementias: Alzheimer's disease, Alzheimer's disease; neurodegeneration; vascular disease, AD: Alzheimer Disease and vascular risk contributors; cerebral blood flow; White matter hyperintensity, AD: Alzheimer Disease and vascular risk contributors; health disparities;Cognitive aging and the Life Course; neuropsychological assessment; AD biomarker; health disparities; psychosis; social determinants, Aging and Cognition; Epidemiology; Dementia; Alzheimer; Cardiovascular diseases and risk factors; Hearing