I'm 34 and I probably spend at lest an hour each evening that I'm at home watching YouTube.
I don't watch any fiction on YouTube except for Adrian Bliss [1] who mocked vloggers and actually has story arcs running through the videos.
I subscribe to many channels but my favourites are Casey Neistat [2], mainly just from the production quality point of view. Tom Scott [3] because he just covers some very interesting topics. And Techmoan [4] because I also have a fascination with old HiFi gear and his puppet sketches at the end of some videos are brilliant.
1. https://www.youtube.com/channel/UChYARX5Yj8CapM-F2Z2vPxA
2. https://www.youtube.com/user/caseyneistat