You need to be 18 years old to get the driver’s license, but you can start with the basic traffic course at 15, and start practicing driving after the course when turning 16 years old. This means you can start training at a traffic school at 16 years old, doing mandatory and normal driving lessons before you’re 18. You can also book the practical driving test in advance of your 18th birthday.
Get more info on the road to the license here: https://en.koer.no/the-fastest-and-most-affordable-way-to-get-your-drivers-licence