W. Va. Code § 3-2-2

(a) Any person who possesses the constitutional qualifications for voting may register to vote. To be qualified, a person must be a citizen of the United States and a legal resident of West Virginia and of the county where he or she is applying to register, shall be at least eighteen years of age, except that a person who is at least seventeen years of age and who will be eighteen years of age by the time of the next ensuing general election may also be permitted to register, and shall not be otherwise legally disqualified: Provided, That a registered voter who has not reached eighteen years of age may vote both partisan and nonpartisan ballots in a federal, state, county, municipal or special primary election if he or she will be eighteen years of age by the time of the corresponding general election.

(b) Any person who has been convicted of a felony, treason or bribery in an election, under either state or federal law, is disqualified and is not eligible to register or to continue to be registered to vote while serving his or her sentence, including any period of incarceration, probation or parole related thereto. Any person who has been declared mentally incompetent by a court of competent jurisdiction is disqualified and shall not be eligible to register or to continue to be registered to vote for as long as that disability continues.