The show isn't over.
Scrubs is a mid-season replacement on ABC this year. This is probably the last season though because Zach Braff and Bill Lawrence don't wanna do it any more. And Judy Reyes (Carla) wanted more money so she left when they wouldn't give it to her.
So even if it continues after Season 8, they'd have to change the focus of the show.
And to answer Lizzie's question...no.
If you're old, then I'm older.