Fully 69.6 million millennials (defined as people who were 18 to 35 in 2016) and members of Generation X (ages 36 to 51) cast votes in 2016, according to a Pew analysis of data from the Census Bureau. By comparison, 67.9 million baby boomers and members of older generations voted… Only around half of millennials voted in 2016, compared with about two-thirds of older cohorts.
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 Millennial generation as a whole is larger than Gen X (both in absolute size and in the number of birth years it spans). In addition, the ranks of the nation’s Millennials are growing faster than older generations due to immigration, which is likely to be accompanied by increased naturalizations. As a result, Millennials are likely to be the only adult generation whose number of eligible voters will appreciably increase in the coming years.