Besides looking like a police lineup at a nursing home, Sen. Eddie Markey’s new 30-second television ad makes its point.He may be old, but he’s still got a lot of fight left in him. Markey at 80 is being opposed for reelection in the Democrat primary by whipper-snapper Rep. Seth Moulton, 47, of Salem, who has made Markey’s age an issue. In the ad, Markey is flanked in front of a brick wall by Sen. Elizabeth Warren, 77, and Sen. Bernie Sanders, 84, both of whom endorsed him. Rep. Ayanna Pressley is there too. The combined ages of the three...