The graphic below shows the relative partisan voting patterns of individuals who reached the age of 18 during the presidential terms of the past 13 presidents. (In some cases, presidential terms are combined.) The label after the president’s names shows the current age of the individuals who turned 18 during those presidential terms. Each bar shows how much more Democratic or Republican that group voted, compared with the average vote for each election.
The clearest pattern is that younger voters who turned 18 during the presidencies of Clinton, Bush or Obama –the younger members of Gen X and the Millennial generation – have typically voted much more Democratic than the average.
In contrast, voters who turned 18 during the Ford, Carter, Reagan and Bush Sr. presidencies –much of Generation X and younger Baby Boomers– have voted somewhat more Republican than the average.
The clearest pattern is that younger voters who turned 18 during the presidencies of Clinton, Bush or Obama –the younger members of Gen X and the Millennial generation – have typically voted much more Democratic than the average.
In contrast, voters who turned 18 during the Ford, Carter, Reagan and Bush Sr. presidencies –much of Generation X and younger Baby Boomers– have voted somewhat more Republican than the average.
http://www.people-press.org/2011/11/03/section-1-how-generations-have-changed/