Which old school you talking about? If you're talking "today's" music vs "when hip hop was better"...I'd say 2004 and earlier falls in the various buckets of old school, rap made a big shift in 2005 IMO, and that's where we are today. Of course there's real old school, like pioneer rap 79-86, golden era 87-95/96, shiny suit/platinum era 97-04...
Edit: these dates aren't set in stone, I can already see some argumentative poster coming in here on some "the golden era wasn't such and such....

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Chill