Section 10. Qualifications of senators

No person shall be a Senator unless he shall be a citizen of the United States, of the age of thirty years, and shall have resided three years in this State, and one year in the county or district, immediately preceding the election. No Senator or Representative shall, during the time for which he was elected, be eligible to any office or place of trust, the appointment to which is vested in the Executive or the General Assembly, except to the office of trustee of a literary institution.