No person shall be eligible to the Office of Governor, who is not a qualified elector, and who, at the time of such election, has not attained the age of twenty five years; and who shall not have been a citizen resident of this State for two years next preceding the election; nor shall any person be elected to the Office of Governor more than twice; and no person who has held the Office of Governor, or acted as Governor for more than two years of a term to which some other person was elected Governor shall be elected to the Office of Governor more than once.