I'm 25, and recently started studying at university where most of my peers are 18-20. After getting to know them for a bit, from everything I've gathered most of them have not been in youth groups of any kind (that topic recently came up during lunch), and are also not involved in any other communities at the moment. Also no bands. The contrast to my friends from high school at that age is crazy.
The difference might be more pronounced due to other factors: They are mostly straight A students vs. I was basically the opposite (though my friends did well in school). They mostly grew up in metropolitan areas vs. us in a semi-rural setting.
But even if those are significant factors, that doesn't make the outlook any better, with more and more pressure being put on children to perform well in school and more and more people moving to big cities.