I should begin by saying for the last 4-5 years he has watched (and listened) as my system evolved from mid level to higher level gear. (Odyssey pre and amps, Magnepan 1.7i, then to Pass Labs, Focal 1038be2, cable upgrades, now to my current Scala Utopias).
He has always enjoyed coming into my listening room to hear how the songs he knows so well (from his earbuds and Bluetooth speakers), sound on my system, as well as discovering new music together. He is hooked, to say the least, and I have given him the gear I have moved up from, for him to enjoy in his own space once he has graduated from University. He said this is important to him and he values the degree to which high end audio can deliver. He looks very much forward to the day when he can hook up the components he has inherited!
I would agree with the poster who said, 'they don't know it until they hear it'. This is very true as most of his friends haven't been exposed to high quality audio equipment, but when they have a listen, they hear what it has to offer and it does make an impression. What they choose to do with that will depend on their income, lifestyle and many other factors.
So perhaps it is best for those who seem to worry that HEA is dying, to listen to their systems with young people, but listen to THEIR music, not yours, and you just might find you've helped to create the next generation audiophile.