The Dutch love rules. It's quite complex, but I try to keep it short:
17yo: You can take driving lessons 15hp max, and do the written exam.
18yo: Driving exam A1, you receive license for max 15hp.
20yo: You can take driving lessons for 48hp bikes, and do the written exam A2. If you already have A1, you can skip the written exam.
21yo: Driving exam, you receive bike license "Code 80", max 48hp. After 2 years you automatically receive a full bike license, without any restrictions.
24yo: Driving exam full license, unlimited bike choice.
17yo: You can take driving lessons 15hp max, and do the written exam.
18yo: Driving exam A1, you receive license for max 15hp.
20yo: You can take driving lessons for 48hp bikes, and do the written exam A2. If you already have A1, you can skip the written exam.
21yo: Driving exam, you receive bike license "Code 80", max 48hp. After 2 years you automatically receive a full bike license, without any restrictions.
24yo: Driving exam full license, unlimited bike choice.