“Of course one worries about getting older - we're all fearful of death, let's not kid ourselves. I'm simply not panicking as my laugh lines grow deeper. Who wants a face with no history, no sense of humor?”

"I'm growin old.

Her response when asked about her sense of rhythm in songwriting, as quoted in Life and Lies of an Icon (1995) by Richard Witts.

Source: The Witch of Portobello (2007), p. 152.
Context: You are what you believe yourself to be.
Don't be like those people who believe in "positive thinking" and tell themselves that they're loved and strong and capable. You don't need to do that because you know it already. And when you doubt it — which happens, I think, quite often at this stage of evolution — do as I suggested. Instead of trying to prove that you're better than you think, just laugh. Laugh at your worries and insecurities. View your anxieties with humor. It will be difficult at first, but you'll gradually get used to it. Now go back and meet all those people who think you know everything. Convince yourself that they're right, because we all know everything, it's merely a question of believing.
Believe.

Interview with Associated Press (1987)

When Did Nature Get So Whiney? (12 September 2003)

The "Tetrapharmakos" [τετραφάρμακος], or "The four-part cure" of Epicurus, from the "Herculaneum Papyrus", 1005, 4.9–14 of Philodemus, as translated in The Epicurus Reader: Selected Writings and Testimonia (1994) edited by D. S. Hutchinson, p. vi