“The vitality of children is clean and honest. Their petty shortcomings derive, in ninety-nine out of a hundred instances, from their effete elders’ pettiness. Contagion is a generational fact. But children can develop defenses against their elders’ spiritual scurvy simply because they’re new.”

The Matchmaker (1954)

Source: Brave New World Revisited (1958), Chapter 11 (p. 106)

TV Series and Specials (Includes DVDs), Trick of the Mind (2004–2006)

Adapted from a passage in Schools of Hellas http://www.archive.org/stream/schoolsofhellasa008878mbp#page/n105/mode/2up, the posthumously published dissertation of Kenneth John Freeman (1907). The original passage was a paraphrase of the complaints directed against young people in ancient times. See the Quote Investigator article http://quoteinvestigator.com/2010/05/01/misbehaving-children-in-ancient-times/.
see Respectfully Quoted: A Dictionary of Quotations Requested from the Congressional Research Service, Edited by Suzy Platt, 1989, number 195 http://www.bartleby.com/73/195.html. Last line: "Evidently, the quotation is spurious."
See also this Google Answers discussion http://answers.google.com/answers/threadview?id=398104 about the topic.
Somewhat similar sentiments are in ( lines 961–985 http://www.perseus.tufts.edu/hopper/text?doc=Perseus:text:1999.01.0241:card%3D961) of Aristophanes' The Clouds, a comedic play known for its caricature of Socrates. However, the lines are delivered by the character "Right" or "Just Discourse", not Socrates.
Misattributed

A Testament (1957)