Final answer:
Heart disease is more common in older people due to the natural aging process and other risk factors such as obesity and diabetes.
Step-by-step explanation:
Heart disease is more common in older people compared to younger people because of several factors. One factor is the natural aging process, which leads to the hardening and narrowing of the arteries, known as arteriosclerosis. This reduces blood flow and increases the risk of heart disease. Additionally, older individuals are more likely to have other risk factors such as obesity, diabetes, high blood cholesterol, and a sedentary lifestyle, which further contribute to their susceptibility to heart diseases.