The cough may be due to chronic obstructive pulmonary disease (COPD), but you
should not assume that. If you smoke
cigarettes or marijuana, that could be the cause. But, you should check out the cough with your doctor on this and, at least, have a chest x-ray. Most chronic coughs can at least be controlled, if not totally eliminated.
Age 43 is indeed quite young to have COPD. You are young enough to be tested for the inherited form of COPD/emphysema, called alpha-1 antitrypsin deficiency.