FROM DOCTOR’S DEATH SENTENCE   TO ACTIVE, VIGOROUS LIFE AT 80   [dropcap]I[/dropcap]n 1995 Peter Holler suffered a heart attack that killed most of his heart. Since then he has had a pacemaker, quadruple bypass and defibrillator; his bad heart was wearing on him. In fact, he was simply hoping to survive when Dr. Zannos Grekos, M.D. […]