Final answer:
An applicant must usually be at least 16 years of age to obtain an instruction permit for driving, though requirements may vary by state.
Step-by-step explanation:
To obtain an instruction permit, an applicant must be at least 16 years of age. This age requirement is a common standard across many states for teenagers to begin the process of learning to drive. However, it's important to note that specific requirements, such as age, can vary by state. As such, while the correct answer for many states is 16, applicants need to check with their local Department of Motor Vehicles (DMV) or equivalent authority for their state-specific requirements.
Other eligibility criteria to be at least 18 years of age, like being a lawful permanent resident and demonstrating good moral character, are generally related to different legal processes, such as naturalization to become a U.S. citizen. It is worth noting that citizens who are 18 years of age have the right to vote in federal and state elections according to the Twenty-Sixth Amendment, which underscores the importance of this age in U.S. law as the age of majority for many rights and responsibilities.