I'm not sure that's true. I developed my love for the Hawks when I was a kid. By the time I was 20 I was a dedicated fan. I could be wrong, but I wouldn't expect a lot of people who weren't fans in their 20's (and earlier, really) to suddenly become fans because they now have money when they're in their 30's or 40's.
I look at my kids (age 19-24) and they are much different than my generation (and I don't think it's just because they're young). They have expectations for entertainment that we couldn't imagine, much of it centered around their experience growing up with the internet: social media, video calls, instant media downloads etc. It takes more to engage them and they quickly get bored at games during the media timeouts. You need to engage them and the burrito lift isn't really cutting it.
Facebookers, Snap Chatters, Instagrammers. Less interaction with people face to face and much less physical activity. many kids can't even contemplate going outside to play.
And the thing you mentioned about them becoming bored easily. Always have to be doing something more and more exciting. Setting themselves up for huge disappointment. No wonder the mental health thing seems more prevalent today than ever.