It depends on what your definition of a goth is...
The music came from punk and was called post punk or positive punk in the late 70's early eighties. Bands like The Cure, Joy Division, Bauhaus and the like were considered the first generation. After that it was the Sisters of Mercy, Fields of the Nephilim and the like and then these days its bands like The Cruxshadows. The media clung on to Manson in the late 90's because a lot of metal kids thought he was goth. It was just yet another bad media misrepresentation though. Manson fans were considered "spooky kids" or "mallgoths" because of how they were trendy. They usually were 14-18 and they grew out of it with time. As for "goths" as in those who listen to the old music and the current stuff.. I know quite a few pushing close to 50 if not a few older ones. They don't run around in outfits they found at Hot Topic nor do they listen to black metal and all of these bad numetal bands many kids today confuse as goth.
As for the depression.. a lot of the older as well as the newer bands are socially aware.. ie: political or somewhat self reflective. Politcal material is depressing
.. I mean look at the US's current administration
...
This thing is sticky, and I don't like it. I don't appreciate it.