The resident representative shall be qualified to vote in the Commonwealth, a citizen of the United States, at least twenty-five years of age, and a resident and domiciliary of the Commonwealth for at least seven years, immediately preceding the date on which the resident representative takes office. A different period of residence and domicile may be provided by law. No person convicted of a felony in the Commonwealth or in any area under the jurisdiction of the United States may be eligible for this office unless a full pardon has been granted.