Part of the issue, I think is that teenagers are more restricted by parents, laws, and business owners than they used to be.
As with younger children, parents are less likely now than in past decades to allow their teenage children to travel alone or hang out in groups without adults present. Legal restrictions compound the issue, with curfew laws being increasingly common, as well as increased driving ages and graduated licenses. Finally, businesses that used to be popular hangouts for teenagers, such as shopping malls have become less welcoming, often having limits on when teenagers are allowed on the premises without a parent.
As with younger children, parents are less likely now than in past decades to allow their teenage children to travel alone or hang out in groups without adults present. Legal restrictions compound the issue, with curfew laws being increasingly common, as well as increased driving ages and graduated licenses. Finally, businesses that used to be popular hangouts for teenagers, such as shopping malls have become less welcoming, often having limits on when teenagers are allowed on the premises without a parent.