Causes of Skin Aging Causes of Skin Aging Intrinsic Causes of Skin Aging Free Radical Theory of Skin Aging Why Chronic or Excess Inflammation Cause Skin Aging Skin Aging: Mitochondria Damage and Cellular Energy Reduction Causes of Skin Aging: Glycation Causes of Skin Aging: DNA Damage Programmed Epigenetics Of Chronological Skin Aging Causes of Skin Aging: Gene Deregulation Hormone And Skin Aging External Causes of Skin Aging Photo Skin Aging – UV Radiation And Skin Aging Life Style Factors That Cause Skin Aging How Smoking Cause Skin Aging The Effect of Alcohol And Substance Use On Skin Aging The Effect of Substance (Drug) Addiction on Skin Aging Dietary Habits That Accelerate Skin Aging – Foods To Avoid The Effect of Stress On Skin Aging Effect of Environmental Pollutants And Toxics On Skin Aging