Except as otherwise provided by law, a person who has not attained the age of eighteen years before the closing of the books of registration preceding any election, including presidential primary elections, but attains that age before the next ensuing election appears before the county board of voter registration and elections and makes application for registration, under oath as to the facts above stated entitling a person to registration, the board shall register the applicant, if he is otherwise qualified. Any person not laboring under the disabilities named in the Constitution and in § 7-5-120 and whose qualification as an elector is completed after the closing of the registration books, but before the next ensuing election, has the right to apply for and secure registration at any time within one hundred twenty days immediately preceding the closing of the books for the election or for the primary election preceding the election. Written notification of approval or rejection must be issued personally or mailed by the board to each applicant on a form to be prescribed and provided by the State Election Commission. The decision of the county board of voter registration and elections may be appealed as provided by § 7-5-230.