Trend charts showing partisanship among age cohorts of registered voters, based on decade born. Voters born in the 1940s have had a Republican tilt for the last several years – but were evenly split in their partisanship a decade ago. Voters born in the 1990s are more aligned with the Democratic Party than those in older age cohorts. 62% of voters born in the 1990s currently associate with the Democrats.