It is difficult to generalize how long a 40-year-old with coronary heart disease can live, the specific time is related to the clinical type of coronary heart disease and the early and late period of the disease. The clinical types of coronary heart disease include angina pectoris, myocardial infarction, myocardial fibrosis, and sudden coronary death. It is difficult to predict how long a 40-year-old patient will live, as the type of disease and the period of time of the disease are different for each person, and there will be a difference in the period of survival. In the early stages of coronary artery disease, life expectancy may not be affected if the disease is stabilized by lifestyle interventions and clinical medications. For middle to late coronary artery disease, if the patient is combined with diabetes, hypertension and other underlying diseases, and at the same time do not pay attention to the regularity of work and rest as well as standardized treatment, then it is very easy to have an acute infarction or sudden death, which will immediately jeopardize the life. It is recommended that patients with coronary heart disease diagnosed early in the guidance of a professional doctor for standardized treatment, usually pay attention to life to quit smoking and alcohol, low-salt, low-fat diet, keep a happy mood.