Except as provided in subsection (b) of this section, an individual may become registered to vote if the individual: is a citizen of the United States; is at least 16 years old; is a resident of the State as of the day the individual seeks to register; and registers pursuant to this title. Notwithstanding paragraph (1)(ii) of this subsection, an individual under the age of 18 years: may vote in a primary election in which candidates are nominated for a general or special election that will occur when the individual is at least 18 years old; and may not vote in any other election. An individual is not qualified to be a registered voter if the individual: has been convicted of a felony and is currently serving a court–ordered sentence of imprisonment for the conviction; is under guardianship for mental disability and a court of competent jurisdiction has specifically found by clear and convincing evidence that the individual cannot communicate, with or without accommodations, a desire to participate in the voting process; or has been convicted of buying or selling votes.