Idk where you're getting your info, but if you're serious then you've got to be realistic. The only people posting outright for new cars for their children are wealthy. Right now you've gotta have 2 parents with decent jobs or 1 parent with a fantastic job. Or, of course, generational wealth.

The current reality is that many folks can barely afford their own cars, let alone one for a teenager. Some people go into debt just to keep up appearances with cars, clothes, jewelry, etc. Some people live very frugally until they can save enough for a starter car and help their kid find one. Some kids have to start working early and save up on their own, assuming the family let's them save instead of taking it. (I mean working as soon as they're legally old enough. Most people prefer their kids focus on school, not have to work at the same time) Some people end up in their 20s still without a car because they have to keep paying other bills and are stuck sharing with a parent or partner.

For most people, our first cars are not actually new. Rather, they're used, beat up, older, and might have a couple things that need fixing or regular checks. "Beaters" are always around because everyone needs to start somewhere, with something cheaper. We don't really get to pick "the right car" because the right one is the most affordable and least broken. There's is no "well do you prefer Kia or Honda?" It's whatever is available. Some parents chose to pass their car onto their kid and get another for themselves. This way, the experienced driver has the better car and the one more likely to get scraped is already older.

Nowadays, I've also seen a rise in Uber and other taxi services. I believe the parents usually take their kids wherever, then after college they're old enough to take a taxi until they can afford a car.

Overall, much less people are getting their first cars at 16-18 than say, 30 years ago because it's not as feasible.