In this lesson, you will understand how aging works in your body. You will explore why telomeres shorten and how this affects cell division. Also you will see how stem cells repair tissues less effectively as you get older, learn about cellular damage from stress and chemicals, and how it affects your body. You will understand why aging causes changes in skin, muscles, and energy, also learn simple ways your body protects itself and adapts over time. This lesson will help you understand your body and how to keep it healthy.