Final answer:
Vertical driver's licenses are issued to individuals under age 21 as a form of legal discrimination based on age, in line with societal and legal standards such as voting age restrictions and alcohol consumption laws.
Step-by-step explanation:
In the United States, vertical driver's licenses are typically issued to individuals under age 21. This is a form of legal discrimination based on age, similar to how laws may restrict alcohol consumption to those over age 21. Such measures are designed to provide safeguards based on maturity and to ensure public safety, reflecting societal and legal expectations that vary with age.
For example, this type of regulation aligns with other age-based regulations such as the minimum voting age, which is established at eighteen years as per the Twenty-sixth Amendment to the United States Constitution. Moreover, age restrictions are apparent in other aspects such as employment policies, voter registration processes, and the passage of laws limiting the use of certain products to specific age groups.