Which of the following is NOT a qualification to become a notary public in Illinois?

To become a notary public in Illinois, one of the qualifications is that the individual must be at least 18 years old, not 21. This means that being 18 is sufficient to qualify for the role, making 21 an incorrect age requirement. Hence, this choice reflects a misunderstanding of the actual age requirement.

While being a US citizen or permanent resident, and being able to read and write English are indeed qualifications for notary public status, the requirement to be a resident of Illinois for at least 30 days aligns with the necessity to establish a connection to the state prior to applying. Therefore, these qualifications are accurate.

In summary, the qualification that requires an individual to be at least 21 years old does not align with Illinois statutes, making it the option that is not a valid qualification.