Consider; Charles de Gaulle was president of France at the age of 79. Some say he was the greatest modern leader in French history.
Ditto for Konrad Adenauer, declared by many to be the greatest chancellor of the German Republic in its modern history. Compare him to Helmut Kohl, for example, who presided over the reunification of Germany and was in the process of a Shakespearian moment, with greatness thrust on him, only to self implode in the midst of a tawdry, greedy scandal. Adenauer served Germany with wisdom and class until the age of 87.