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It is better to have a meaningful life and make a difference than to merely have a long life.

If your contribution has been vital there will always be somebody to pick up where you left off, and that will be your claim to immortality.

I have lived long enough both in years and in accomplishments.

When you extend life span, that's really something. That's hard to do.

I need to live a long time to fulfil all the things I want to do.

Make life exciting, and you live longer.

As long as you live, keep learning how to live.

I feel that my whole life is a contribution.

I don't work on longevity, I work on keeping people healthy.