The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.
Leadership is about making others better as a result of your presence and making sure that impact lasts in your absence.
In the end, it is not the years in your life that count, but the life in your years.