In this study we are looking for healthy participants age 30 and older who will undergo blood tests that will allow us to measure markers of oxidative stress. Participants will also undergo tests specifically designed to look for evidence of early multi-organ disease. These exams will include an evaluation of lung function (spirometry test), exercise capacity (using a stationary bike), bone density scan looking for osteoporosis, ultrasound of the artery of the neck (carotid) and artery of the arm (brachial), nerve conduction study, bio-impedance (Body fact composition) and several questionnaires to assess memory and mood. The participants require one screening visit and a follow up visit to undergo the tests.