Colo. Const. art. IV, § 4

Qualifications of state officers. No person shall be eligible to the office of governor or lieutenant governor unless he shall have attained the age of thirty years, nor to the office of secretary of state 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 twenty-five years and be a licensed attorney of the supreme court of the state in good standing, and no person shall be eligible to any one of said offices unless, in addition to the qualifications above prescribed therefor, he shall be a citizen of the United States, and have resided within the limits of the state two years next preceding his election.