How did age and neighborhood demographic shifts shape a mayoral victory?
Core argument: Mamdani's average margin of victory reached 30 points in precincts where the median age is under 45, among the highest of any demographic group.
In precincts where the median age is under 45, [Mamdani's] average margin of victory was 30 points — among the highest of any demographic group. Voters younger than 45 — about 46% of registered voters in the city — made up about 43% of those who cast their ballots in person early or on Election Day. That outpaces the 2022 midterms, when Gov. Kathy Hochul, a Democrat, narrowly fought off a challenge from Lee Zeldin. That year, younger voters made up 36% of those who voted. (Mail ballots, which are still being accounted for in the 2025 election, generally make up a small share of overall votes.) In neighborhoods where the nonwhite population is shrinking [Mamdani] notched some of his strongest performances. In parts of the city where the Black or Hispanic population share had declined and the white population share had grown since before the pandemic, Mr. Mamdani won by more than 50 percentage points.


