Genetic and Epigenetic Signatures of Translational Aging Laboratory Testing (GESTALT)

* Since the study of gene expression and epigenetic regulation are essential aims of GESTALT, all participants are required to consent to DNA/RNA testing and storage at all visits. Participants that refuse genetic testing and storage will not be eligible to participate or to continue to participate in the study. The criteria below for each group pertains only to the Screening and Baseline Visits, except where otherwise noted. If any of the conditions develop while the participant is in the study, the participant remains in the study. However, participants that develop severe cognitive problems and are diagnosed by the cognition group with dementia, will no longer be able to participate in the study. INCLUSION CRITERIA for the Healthy Group: * Age greater than or equal to 20 years of age. * Are willing to return every 2 years for study visit procedures. * Agree to genetic (DNA/RNA) sample collection, analysis and storage. * Have good venous access for cytapheresis and are in good health as determined by the Apheresis Health History Questionnaire and are found eligible for apheresis (Apheresis Eligibility form). * Weigh greater than or equal to 110lbs and a body mass index (BMI) \< 30. * Do not have established genetic diseases such as sickle cell, hemochromatosis (iron overload), cystic fibrosis or Ehlers-Danlos syndrome (connective tissue disorder). * Do not have autoimmune diseases such as Hashimoto's thyroiditis, Myasthenia Gravis or Rheumatoid arthritis. * Report that t…