No person shall be eligible to the office of governor or lieutenant governor unless he shall have attained the age of thirty years at the time of his election; nor to the office of secretary of state, state controller, or state treasurer, unless he shall have attained the age of twenty-five years; nor to the office of attorney general unless he shall have attained the age of thirty years, and have been admitted to practice in the Supreme Court of the state or territory of Idaho, and be in good standing at the time of his election. In addition to the qualifications above described each of the officers named shall be a citizen of the United States and shall have resided within the state or territory two years next preceding his election.