The Wear and Tear Theory suggests that aging occurs due to the gradual damage and deterioration of cells and tissues over time. This theory posits that as organisms age, their bodies accumulate damage from various sources, such as environmental factors, metabolic processes, and physical stress. This accumulated damage can lead to a decline in function and an increased risk of diseases. According to this theory, the body's ability to repair itself diminishes with age, making it more susceptible to the effects of wear and tear. Factors like lifestyle choices, such as diet and exercise, can influence the rate of wear and tear, impacting overall health and longevity.