There was the initiative to install a speed limiter to regular cars to turn them into "light cars" for kids but that didn't pass for some reason. EU regulations? How is it possible in Sweden?
Countryside can be really sparse, with current amount of people a kid's nearest friend might live 5 km away. Cars make so much sense there. Lots of people learn to drive really young with a "peltoauto", a field car. That's legal as it's on private property.