Boomers as they have much higher turnouts than millennials despite being smaller in #'s and generally seem more active in party politics. Millennials care just as much about politics, but I find are more issue driven than party driven whereas older generations tend to often be more party driven than issue driven. Otherwise always vote for a certain party not matter what whereas younger generations tend to vote for which party is closest to their views on issues.
Politically active Americans are subculture-driven at any age. Younger people's political subcultures have less to do with party because mass-mobilizing political parties are institutional structures and younger Americans often have next to no meaningful social capital, sometimes even no interest in acquiring any.
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