How long you can live with emphysema at the age of 40 depends on the specific condition of the patient and cannot be generalized. Emphysema is an irreversible chronic respiratory disease with expiratory dyspnea as the main manifestation, usually related to smoking, infection and atmospheric pollution, etc. The main symptoms include chest tightness and shortness of breath, cough, dyspnea and coughing sputum. If the condition of 40-year-old patients is mild, through active treatment, strengthen exercise, avoid causing lung infection, generally does not affect the patient’s life expectancy, and can survive with the disease for a long time. If the patient’s condition is more severe and long-term smoking leads to the disease gradually aggravated with age, resulting in a decline in lung function and related complications, such as heart failure, respiratory failure, etc., then the patient’s life can be seriously endangered, affecting the patient’s survival time. Therefore, 40-year-old emphysema patients should develop good habits, maintain a regular life, do not smoke, keep the indoor environment clean and fresh air, and avoid catching cold and flu to prevent serious illness.