In most places you have to be at least a legal adult to run for mayor, but the exact minimum age depends on your country, state or province, and even the specific city charter.

Basic age rule

  • Many U.S. cities set the minimum age to run for mayor at 18 , often phrased as “must be a qualified/registered voter,” which in practice means 18 or older.
  • Some cities and states use higher minimum ages such as 21 , 25 , or even 30 , especially in larger cities.
  • A few city charters technically list no explicit age, but you still have to meet voter eligibility and other requirements, which normally keeps the practical minimum at 18+.

Examples from real cities

  • Several big U.S. cities over 200,000 people require mayors to be at least 18 or simply a registered voter, but some are stricter.
  • Denver, Honolulu, Memphis, Nashville, and St. Louis require mayors to be 30 years old.
  • Baltimore, Philadelphia, Kansas City (MO), Washington, DC and a number of others use 25 years old as the threshold.
  • Some mid‑sized cities, like Fort Collins (Colorado), set a mayoral minimum of 21 years old.

Why it varies so much

  • Age rules for mayors are set in local or state law, so each jurisdiction can decide what it thinks is a mature enough age for executive leadership.
  • Lawmakers balance giving younger people a chance to run with concerns about experience and public confidence in city leadership.

How to find the rule for your city

  • Check your city or town’s charter or municipal code online; “qualifications for mayor” or “candidate qualifications” pages usually list the age requirement clearly.
  • If that’s confusing, call or email your local elections office or city clerk and ask: “What is the minimum age to run for mayor here, and do I just need to be a qualified voter?”

So the direct answer is: you often need to be at least 18, but in many cities you must be 21–30, and the only way to know for sure is to look up your specific city’s rules.