According to California Code, which of the following cannot serve as a person eligible to hold an insurer's license?

To determine eligibility for holding an insurer's license in California, it's important to note the specific requirements set out in the state's code. In California, a human being must be at least 18 years old to qualify for such a license. Therefore, a person aged 16 does not meet this minimum age requirement, making them ineligible to hold an insurer's license.

In contrast, a corporation, an estate of a deceased person, and a trust are all valid entities through which a license can be held. These types of entities comply with the regulations and can engage in business activities associated with insurance underwriting and sales. The qualifications for these entities differ from those for individual applicants, as they operate under different legal frameworks. Thus, the age restriction placed on individuals specifically excludes those younger than the minimum age requirement from holding an insurer's license.