At 15, I was still too young legally to have a license. Actually, when I look back, maybe too young to drive on the streets anyway, lol.
Didn't have my first car until I was about 19, needing something to commute to college in. Bought a Morris Mini Minor 850. A really fun but underpowered car. It has such good handling, the trick to driving it was to get it up to speed, and then let the superb handling get you through the corners past everyone else without slowing.
Bought my first Alfa, a slightly used but absolutely showroom quality 64 Giulia Sprint GT (2nd one in the US), when I graduated from college and started getting some decent money from my first job.