The Nobel Peace Prize laureate Albert Schweitzer is reported to have said: “I have no intention of dying so long as I can do things. And if I do things, there is no need to die. So, I will live a long, long time.” He in fact lived to the age of ninety.
From The Wisdom for Creating Happiness and Peace, part 1, revised edition, p. 296

Daisaku Ikeda

No matter how much wealth or power one may possess, such things vanish like a fleeting dream in the face of the unrelenting reality of old age and death. What is crucial, then, is the philosophy one upholds and the life one has lived.
>From The Wisdom for Creating Happiness and Peace, part 1, revised edition, pp. 297-298

Daisaku Ikeda

We of the Soka Gakkai, however, are able to exert ourselves fully today, confident that our movement for kosen-rufu will show wonderful development thirty or fifty years from now. Why? Because we have successors, our future division members.
>From The Wisdom for Creating Happiness and Peace, part 3, revised edition, p. 408

Daisaku Ikeda