Answer:
Not reasonable because it ignores valid objections that could be raised.
Explanation:
As the author says "There is nothing magic about the number of years in a person's age", it is true there is nothing magic but this is not reasonable because there are two crucial points related to age and driving:
i- development and healthy;
ii- criminal liability and civil responsibility.
Both teenagers and older people have specific age related conditions. Many scientific studies suggest that teenagers don’t have their brain and psychological characteristics fully developed, because they haven’t fully developed their cognition and sense of responsibility they may choose to take more risks when driving such as using cellphone or drinking and driving. On the other side the elderly tends to loose physical strength, having issues with vision, audition or mental abilities, or responding slowly to events and be impaired to operate a vehicle.
So many states will define a minimum age for driving based in the age of criminal liability and civil responsibility stated in the constitution or in laws. It is not just about parents trust and sense of responsibility but also about laws and substantial knowledge about human development.