When I was 16 I was working a job and going to HS... no car.
When I was 18 I was working a job, finishing HS, and joined the Navy... no car.
When I was 21 I got out of the Navy and started College... no car.
I got my first car at age 22, (about a week after my birthday). It was an 89 Escort LX 5 door. It was a POS, but I loved it. Delivered pizza in it, got laid in it, got in an accident in it and gave it to my folks. Finished all but my last semester of school without a car, (till I bought a new 96 Mustang GT shortly before graduation)...
Of course, I guess these days you "have" to own a car... same as a cell phone... right?