I think its even more insidious than that. The political party machine on both the GOP and Dem side control what candidates are even put in front of us. Populist antiestablishmentism doesn't get you far because both the media and the political party itself are working against you. So you will still see younger politicians who hold these opinions in positions of power, because these are the opinions of the elite more than anything generational, and these are the candidates who receive the most support and most air time in front of voters.