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