To be eligible to fill the office of district attorney, a person must: (1) Have been a resident citizen of this state three years just preceding his election or appointment; 299 15-18-3 (2) Permanently reside in the circuit at the time of his election or appointment; (3) Have attained the age of 25 years; (4) Have been duly admitted and licensed to practice law in the superior courts for at least three years; and (5) If previously disbarred from the practice of law, have been reinstated as provided by law. (Laws 1841, Cobb’s 1851 Digest, p. 1122; Laws 1850, Cobb’s 1851 Digest, p. 1036; Code 1863, § 349; Code 1868, § 410; Code 1873, § 375; Ga. L. 1877, p. 13, § 1; Code 1882, § 375; Civil Code 1895, § 4390; Civil Code 1910, § 4924; Code 1933, § 24-2901; Ga. L. 1964, p. 362, § 1.)