[Nextgrid]

Do they not have a license because they'd rather self-learn, or do they not have a license because they don't meet the required age?

While I don't doubt that some people would not give a shit and self-learn and drive the A-tractors without a license anyway, at least lowering the age for a license would mean that those who want to be safer can get it.

You could even attach restrictions to said license that incentivise safer driving over time - a teenage license can be obtained at 15 but comes with some restrictions that get lifted over time (unless caught breaking the rules) and inherently "converts" to a full license by the time you're 18 assuming you haven't lost it beforehand due to unsafe driving.