Hmm... Maybe Naruto? (including Shippuden[spelling?]) Dunno why, but it seemed pretty long...
Yuugiou actually had some great story structure in the Memories arc. I wouldn't say DBZ lasted beyond its golden age, its final episode still had ratings somewhere in the 20% area, most anime can't even get upwards of 7% and only the really good drama can get 20% or higher, so it could have stayed a lot longer.I think Dragon Ball Z and Yu-Gi-Oh! lasted way past their golden age. Some animes just don't know when to quit (well, these too actually had series finales).
GT butchered the good of dragon ball and dragon ball Z, and its not even made by the same person so I would consider it like some kind of tribute to dragon ball Z.dragonball Z is one of the longest cuz after dragon ball Z is dragon ball gt and dragonball have several movies......and Ghost fighter or yu yu hakusho ....yeah doraemon is one of the longest
Toriyama actually created the character designs and worked on the plot, he obviously didn't have the input he did in Dragonball/Z, but he had a presence.GT butchered the good of dragon ball and dragon ball Z, and its not even made by the same person so I would consider it like some kind of tribute to dragon ball Z.