(1) Provisions respecting disqualifications for particular offices are contained in the constitution and in the provisions of the laws concerning the various offices.
(2) A person is not eligible to hold civil office in this state who at the time of election or appointment is not 18 years of age or older and a citizen of this state.
(3) A person is not eligible to hold civil office in this state who at the time of the filing deadline for the race is not registered to vote in Montana. An exemption must be granted for an individual who will turn 18 years old before the election, but not before the filing deadline pursuant to 13-1-114.