How long a person will live after having a pacemaker defibrillator implanted will depend on the persons overall health and the age of the person when the pacemaker defibrillator was implanted.
On average most people who have an implanted pacemaker defibrillator will live at least 7 to 10 years after they have it implanted.
Some people live easily for decades with a pacemaker defibrillator so it doesn't mean that you'll have a short life after having a pacemaker defibrillator installed as many people do live a full long life with one.