I believe the two biggest barriers to young people being introduced to home audio are money and exposure. I'm not sure many people, regardless of age, know just how much better their sound can be.
I didn't get into it until later in life, when I was about forty. Other than a few friends who were into car audio, I never knew anyone who put much time or effort into audio and had never been exposed to any quality systems. I was content with a sound bar, blissfully ignorant of what I was missing out on.
After I got a job installing satellite, I was working at an install for some rich old farmer. He was more than happy showing off his home theater room and his sound system blew me away. I had never seen or heard anything like it. That night I set about learning what I could to improve the audio in my home.
Now I knew I wouldn't be able to have the same quality set up he had with his expensive and custom gear. But I knew I'd at least be able to make a significant improvement on what I did have.
My employer gave us bonus points for various things that could be used towards different products and services. I had accrued plenty with no real idea of what to use them on. I used them to get all my initial gear, methodically building a 5.1 system. It wasn't (and isn't) high quality stuff but was still a huge improvement over that sound bar. Not only that, but I really enjoyed learning about it. Not knowing anyone I could ask questions to and not being around actual sound systems was a hindrance, but reading and researching and looking around for deals is still a blast.
If I hadn't been routed that job at that guys house, I'd probably have never known what I was missing. And if I didn't have those award points to get my initial gear, I'd have probably gotten overwhelmed by the cost of putting a decent system together.
I've added a few things here and there to that original 5.1 set up (currently running 9.2) but for the most part am still using the same stuff. My home theater system sucks compared to 99% of the people in these forums (why I rarely post, lol)....but is better than 99% of the people I meet in real life. That, along with the fun of learning about it and putting it together, makes it worth the time, attention, and cost the hobby requires.
Sorry for turning a post into a novel.