Answer:
Because of his/her lack of experience.
Step-by-step explanation:
It is logically expected that a younger driver will pay a higher price for his/her car insurance since insurance companies are aware that younger drivers are more likely to expermient a traffic accident due to their lack of experience, and thus raise the price in comparison with a more experienced person. Also, the more traffic accidents and fines the driver gets, the more expensive the fee will get.