Section 42. Registration as a voter shall be by affidavit of registration made in conformity with the requirements of this chapter by any person at least 16 years of age or older. Except as provided in sections 42A and 65, every person whose name has not been entered in the annual register in accordance with sections thirty-four through thirty-seven inclusive, or a corresponding provision of law applicable to a city or town having a listing board, must, in order to register as a voter, make an affidavit of registration as provided in this chapter and in the National Voter Registration Act of 1993.