This poll is obviously crap, but questionable crosstabs do not always mean (as some believe) crapiness.
Check out PPP's final Florida (which they nailed) poll in 2012:
http://www.publicpolicypolling.com/pdf/2011/PPP_Release_FLNC_1105.pdfThe voting intentions of the 46-65 age group were, in this poll (again, PPP nailed the FL result), almost identical to the 18-29s.
Compare that to the exit poll numbers:
http://edition.cnn.com/election/2012/results/state/FL/president/ They showed Obama as having won the under 30s by 34%, compared to 9% in PPP's poll.