The way I’ve heard it described is the boomers were always out for self-interest. They voted for progressive policies when they were young because it benefitted them. They then voted for conservative policies when they got older because it benefitted them. The world they created was made for them and no one else, so now they vote to keep it that way. It just looks like they got more conservative as they got older because conservatives on the whole want things to stay the same forever, or at most go back to some ideal past where everything was in their favor, which is just more self enrichment. They pulled up the latter because others having more means them having less. It doesn’t help that they lived through an era where we pumped lead into the air.