Additional Study Information: We are seeking healthy volunteers (HIV-negative) for a study seeing if HIV is associated with faster biological aging among older African American adults, whether faster biological age is related to health conditions that typically occur in older people and whether these conditions might be due to stress or over-activity of certain parts of the immune system. The study involves one in-person visit and takes approximately 1 hour and 45 minutes. We administer a questionnaire (on demographics, lifestyle, and health), cognitive assessments, basic body measurements, and perform a blood draw. We compensate $50 for your time and travel.