Apprentices for the Port of Charleston are taken only by pilots licensed under Sections 54-15-120 and 54-15-130 for the port and must be approved and certified by the commissioners of pilotage for the port. They must not be under eighteen years of age, must be a graduate of an accredited four-year college or shall hold an unlimited ocean third mate's license, must have 20-20 visual acuity uncorrected or corrected by contact lens, must have good color vision evidenced by ability to distinguish colors by means of a test accepted by the United States Coast Guard, must have good natural hearing, and must have other physical and mental qualifications required by the commissioners of pilotage for the port. Satisfactory certificates of the requirements of this section must be filed with the commissioners of pilotage for the port before the applicant may be accepted as an apprentice.