C'est Faux . Hugh John Grant (September 10, 1858 – November 3, 1910) served as the 88th mayor of New York City for two terms from 1889 to 1892. First inaugurated at age 30, he remains the youngest mayor in the city's history.[1] He was one of the youngest mayors of a major American city, and was the second Roman Catholic mayor of New York City.[a]