Sen. Ed Markey won Massachusetts’ Democratic Senate primary Tuesday, turning back a challenge from Rep. Seth Moulton that centered on the 80-year-old incumbent’s age. A final Emerson College Polling survey found Markey leading Moulton 60% to 33% among likely Democratic primary voters, with voters under 40 breaking decisively toward Markey. In Massachusetts, many voters appeared to separate Markey’s age from his politics, viewing the longtime senator as more closely aligned with a younger generation of progressives than his younger opponent.