Good news about the electorate Pollsters Celinda Lake and Mac Heller discuss the changing age demographics of American voters: It’s easy to envision the 2024 presidential election becoming the third straight contest in which a veteran Democrat goes up against Donald Trump. Once again, the Democrat wins the popular vote but swing states are tighter. Could go either way — and has, right? But things are very different this time, and here’s why: The candidates might not be changing — but the electorate has. Every year, about 4 million Americans turn 18 and gain the right to vote. In the eight years between the 2016 and 2024 elections, that’s 32 million new eligible voters. Also every year, 2½ million older Americans die. So in the same eight years, that’s as many as 20 million fewer older voters. Which means that between Trump’s election in 2016 and the 2024 election, the number of Gen Z (born in the late 1990s and early 2010s) voters will have advanced by a net 52 million against older people. That’s about 20 percent of the total 2020 eligible electorate of 258 million Americans. And unlike previous generations, Gen Z votes. Comparing the four federal elections since 2015 (when the first members of Gen Z turned 18) with the preceding nine (1998 to 2014), average turnout by young voters (defined here as voters under 30) in the Trump and post-Trump years has been 25 percent higher than that of older generations at the same age before Trump — 8 percent higher…