Section 1. Every citizen of the United States who shall have attained the age of eighteen years, have been a resident of this State not less than one year next preceding the election and be a voter registered as provided by law, shall be qualified to vote in any state or local election. [Am Const Con 1968 and election Nov 5, 1968; am SB 41 (1971) and election Nov 7, 1972; am Const Con 1978 and election Nov 7, 1978]