Well, my son is really interested & he's 24. He loves all sorts of music & loves sitting and listening to Dad's system. But then he's been brainwashed...
One day he will end up with my system (hopefully not for another 50 years
) and wants to know how to put it together "but there are a crazy number of boxes and wires to learn about". This more than anything else puts him off the idea of putting together his own system. His problem with "The Stereo" as he calls it is that its easier to stream music than mess around with a turntable and have to set it all up, deal with hum, position speakers accurately etc etc.
If good audio is seen as hassle why would young people want to have it?