Section 4. To be eligible to hold an elective office established by this article, a person must be a qualified elector of this state, must be at least twenty-five years of age on the day of the election, and must have been a resident of this state for the five years preceding election to office. To be eligible to hold the office of governor or lieutenant governor, a person must be at least thirty years old on the day of the election. The attorney general must be licensed to practice law in this state.