What Is The Life Expectancy In A Person With Pacemaker In Heart?

MY Husband has a left bundle branch block and a stent in the artery in his neck,he just recently had a pacemaker/defibralator and his heart is at nineteen percent,he was 37 years old when he had all this happen ,he is now 47 years old,I guess my question is how long can you live at this percent....