Constitution of the State of Ohio Art. V, § 1

Only a citizen of the United States, of the age of eighteen years, who has been a resident of the state, county, township, or ward, such time as may be provided by law, and has been registered to vote for thirty days, has the qualifications of an elector, and is entitled to vote at all elections. No person who lacks those qualifications shall be permitted to vote at any state or local election held in this state. Any elector who fails to vote in at least one election during any period of four consecutive years shall cease to be an elector unless the elector again registers to vote.