I'm with you, and I'm not nearly as old as you (low 30s).
The YouTubers I follow rarely shill for anything I care about. In fact, I don't subscribe to much at all because I honestly don't want to get a stream of mediocre content. I don't understand Twitch (I only watch gameplay videos to get a sense of the gameplay, not to live vicariously through someone else), and I don't understand those stupid "unboxing" and "playing with toys" videos that my kids like so much. In fact, I go so far as to actively discourage YouTube with my children, instead moving them toward Netflix, which had much better production value and usually includes some education.
However, I have acquaintances that love watching streamers, and my wife follows a few live streamers religiously and gets involved in live chat and whatnot. I see that they enjoy that content and I've read literature about it, but I cannot relate.