This study will examine predictors of successful aging outcomes among adults and older adults with and without HIV. We are currently recruiting HIV-negative controls, thus to qualify, you must be HIV-negative, age 50 or older, be proficient in English, must not be mentally impaired or have significant neuromedical issues, and must consent to a blood draw. Eligible participants may be compensated up to $150 for a ~5-hour visit. For more information, please call 205-934-2862.