12.—Subject to section 14 and to the disqualifications set out in F20[sections 13 and 13A] and to the provisions of section 19 relating to co-option, a person is eligible for election or co-option to, and membership of, a local authority, if he or she is a citizen of Ireland or is ordinarily resident in the State and has or will attain the age of 18 years—

(a) on or before polling day at a local election, or

(b) if there is no poll, the latest day for receiving nominations at the election, or on or before the day of co-option to a local authority.