The phrase "youngest mayor" refers to an individual who is the least in age among all mayors. It means that this person became a mayor at a relatively young age compared to others who hold the same position. Full definition
Jacob Sarkil, a former young mayor of Lewisham and youth leader, said recently on Share Radio: «If you don't go to university, life still happens.» (qaeducation.co.uk)
Stewart, who was 26 and the city's youngest mayor when she first won office in 2013, has credentials that could help the GOP in solidly blue Connecticut. (courant.com)
At 11 a.m., Duchess County Executive Marc Molinaro holds the first of two events at which he'll announce his run for governor, Tivoli, where he launched his political career as the youngest mayor in the US at the time. (nystateofpolitics.com)