It isn't a cabal, more of an emergent property of people who don't like change and political process that is effectively only open to citizens who are retired. Which ends up being dominated by old people.

You'll see political change as specific demographic cohorts enter the political process and others die out. I feel like we are at the start of that shift as boomer politicians are starting to die and millenial/gen x politicians are starting to come to prominence. Since millennials are an echo of the boomers population wise, they will probably dominate over the gen x generation.