Healthy Aging and Memory Study

Inclusion Criteria: * 75 years or older. * Fluent in English or Spanish. * Stable medical condition for four weeks prior to screening visit. * Stable medications for four weeks prior to screening visit. * Either cognitively normal, or mild cognitive impairment. If MCI, the subject's CDR at screening have a global score of 0.5. * mMMSE score greater than 88 for subjects with at least 8 years education, or greater than 80 for subjects with less than 8 years education, and FCSRT total free plus cued recall score greater than 44 with 3 learning trials. * Willing to participate in four to five year follow-up study. * Willing to identify person who can serve as informant. * At least six years education or work history sufficient to exclude mental retardation Exclusion Criteria: * Meets DSM IV criteria for dementia * History of clinically significant medical illness that would interfere with participation in trial, including active malignancy, myocardial infarction, or cerebrovascular accident within the past year * Alcohol or substance abuse and/or active major psychiatric disorders * Concurrent participation in a clinical drug trial * History of mental retardation