Yes, it is possible for a 20-year-old to have coronary heart disease (CHD), although it is relatively rare. CHD is more common in older adults, but it can occur at any age. The risk factors for CHD, such as high blood pressure, high cholesterol, smoking, obesity, diabetes, and a family history of heart disease, can affect people of all ages.
In young adults, CHD may be caused by genetic factors, congenital heart defects, infections, drug abuse, or autoimmune disorders. It is important for young adults to be aware of their risk factors and take steps to prevent CHD by maintaining a healthy lifestyle, such as eating a healthy diet, exercising regularly, avoiding smoking and excessive alcohol consumption, and managing any underlying medical conditions. If you are concerned about your risk of CHD, you should talk to your doctor or healthcare provider.