Del. Code tit. 9, § 1142

Elected officials of the County Council shall be citizens of the United States and qualified electors of the County. They shall be residents of the district from which they are elected or, in the event of redistricting, of the district as adjusted for at least 1 year prior to their election. Such officials must not be less than 24 years old when elected to office. The County Council shall be the judge of the qualifications of its members.