When I was a kid kids used to just hang out. We'd take a bus, ride bikes, or walk to the mall, the park, the woods, fast food restaurant, record store, dollar store, etc and just loiter. Nobody had any money to buy anything, but boy we'd browse and loiter. Sometimes we'd just walk for hours. We'd walk miles and miles and miles just to sit at a table at Burger King with a single small fry between our group and hang out there.

Children don't do that anymore; they basically don't leave the house because they have the Internet. They communicate through texting and Discord so they don't even have to "hang out." Beyond the social change, when I was a young adult most malls went 18+ (unless accompanied by parents/guardians) and most other businesses nowadays allow teens to loiter the way we use to. Businesses want people in and out once they are done.

Even if business allowed it, most parents don't allow their kids to leave the house unattended anymore.