." That's a bit more than the 67.9 million cast by baby boomers and older voters. It's the first time in decades that "Boomers and older voters represented fewer than half of all votes."[1]

This is part of a natural generation transition as older generations age and die.

Boomers are still the biggest generational voting block, accounting for 35% of all votes. Generation X provided 26%, millennials 25%, and the Silent Generation 14%. Pew believes, "It is likely, though not certain, that the size of the Millennial vote will surpass the Gen X vote in the 2020 presidential election."

The Pew data for 2016 shows the expected pattern of higher turnout among older voters.