Age-related diseases are health conditions that become more common as people grow older. These diseases often include Alzheimer's disease, arthritis, and heart disease. As the body ages, its ability to repair itself and maintain function decreases, making older adults more susceptible to these conditions. Many age-related diseases are linked to changes in the body's systems, such as the immune system and metabolism. Lifestyle factors, including diet and exercise, can influence the risk of developing these diseases. Early detection and management are essential for improving quality of life in older adults.