Source: 1950s, Artists' Session at Studio 35, (1950), p. 216
“You have got to be able to picture side by side everything Matisse and I were doing at that time. No one has ever looked at Matisse's painting more carefully than I; and no one has looked at mine more carefully than he.”
Quote by old Picasso (1960's); as quoted in 'Matisse & Picasso', Paul Trachtman, Smithsonian Magazine, February 2003, p 1
1960s
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Pablo Picasso 128
Spanish painter, sculptor, printmaker, ceramicist, and stag… 1881–1973Related quotes

As quoted in "Dr. Clemente, I Presume" https://news.google.com/newspapers?id=fL1HAAAAIBAJ&sjid=ZoAMAAAAIBAJ&pg=6750%2C4033368 by Jim Murray, in The Los Angeles Times (March 24, 1972), p. E1
Other, <big><big>1970s</big></big>, <big>1972</big>

Source: Why Men Earn More (2005), p. 199-200.

A Tenderfoot in Space (p. 689)
Short fiction, Off the Main Sequence (2005)

Crabbed Age and Youth.
Virginibus Puerisque and Other Papers (1881)
Context: Age may have one side, but assuredly Youth has the other. There is nothing more certain than that both are right, except perhaps that both are wrong. Let them agree to differ; for who knows but what agreeing to differ may not be a form of agreement rather than a form of difference?