a person qualified (age apart) to vote as an elector at a ward election shall be entitled to do so if he is of the age of 18 years or over on the date of the poll, except that,

a person registered in the ward list to be used at a ward election shall not be entitled to vote as an elector at the election if his entry in the ward list gives a date later than the date of the poll as the date on which he will attain the age of 18 years.