No stores, markets, and services also translates to a low availability of jobs.

As a high schooler, you almost inevitably need some kind of "boost" to get out on your own. Maybe college, but at least a car or help signing for an apartment. Without at least some kind of help, it's easy to get literally "stuck" at age 18 or 19. No money for a car or apartment, but no close access to employment without one of those tools.

I see parents moving to the suburbs to give a safe life for their kids away from "bad things" in the city. Meanwhile, parents may not be home until 6 or 7 pm due to leaving the city in traffic, and bored suburban teens can get into just as much trouble as their urban counterparts. Unless the parents are also able to commit some serious money to other involvement for their teenagers, the suburban life may not play out well for them.

Something that really struck me, particularly in Northern Europe, was that the young adults seemed to be a lot more self assured. There are probably a lot of reasons for this that I do not notice, but I wonder how much results from having a practical path to an independent and productive life. This in turn opens up so many other doors socially.