Lincoln-Douglas Debates http://www.nps.gov/liho/learn/historyculture/debate1.htm (21 August 1858)
1850s
“There is no question about it. In the next 40 years a Negro can achieve the same position that my brother has.”
AP report with lead summarizing of remarks stating "Robert F. Kennedy said yesterday that the United States — despite Alabama violence — is moving so fast in race relations a Negro could be President in 40 years." "Negro President in 40 Years?" in Montreal Gazette (27 May 1961) http://news.google.com/newspapers?nid=1946&dat=19610527&id=y40tAAAAIBAJ&sjid=F50FAAAAIBAJ&pg=5424,5208719
Context: The Irish were not wanted there [when his grandfather came to Boston]. Now an Irish Catholic is president of the United States … There is no question about it. In the next 40 years a Negro can achieve the same position that my brother has. … We have tried to make progress and we are making progress … we are not going to accept the status quo. … The United States Government has taken steps to make sure that the constitution of the United States applies to all individuals.
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Robert F. Kennedy 72
American politician and brother of John F. Kennedy 1925–1968Related quotes
The Ballot or the Bullet (1964), Speech in Cleveland, Ohio (April 3, 1964)
From interview with Subhash K. Jha
“As for whether Perl 6 will replace Perl 5, yeah, probably, in about 40 years or so.”
"Developers can unwrap Perl 6 on Christmas", Infoworld, 2015-12-21 http://www.infoworld.com/article/3017418/application-development/developers-can-unwrap-perl-6-on-christmas.html
Other
The Second Declaration of Havana (1962)
As quoted in "Socialism is So Hot Right Now" https://www.commentarymagazine.com/articles/socialism-hot-right-now/ (17 September 2018), by Jonah Goldberg, Commentary
1990s