Think of these numbers - 30-44-53. Those are statistically reliable since the Civil war, give or take a year or two on either side. They are the ages of the oldest member of a generation when that generation first arrives in the House, then becomes the largest minority, and finally becomes the generational majority. You can look back on pretty significant changes when those numbers kicked in. The Silent Generation became the House majority generation in 1977 and the government went from pro-labor to pro-big business almost overnight. Your top 1% earners chart posted earlier pretty clearly shows that. The Silent Generation were the majority throughout the Reagan years. Boomers first became the House majority in 1995 (think Newt) and the bitching and partisanship hasn't stopped since. I'll admit, Boomers have been terrible at running Washington.
The Senate is different - 38-49-58. Almost thirty percent of today's Senate are still Silent Generation members. And a lot of the leadership posts are still held by them. Boomers have been the generational majority in the Senate for about ten years. Probably within the next two elections cycles, Boomer leadership will replace Silent Generation leadership there (Does that give you a chill?).
Everything I've read seems to indicate that real change might not happen for a while, since the Gen Xers, who currently control one-third of Congress, are more like the Boomers than the Boomers, at least the older first half of them are. Think Paul, Rand, Cruz, Wasserman, Walker, Cantor, Palin. They haven't done dick to address the problems. They're just like the generations before them, more interested in petty squabble and getting re-elected than in doing the right thing. I hope the Millenials turn out to be different, but I'm not betting my IRA on it.