By this logic, you'd also have to blame Gen X and Millenials, as they've all been voting for at least a decade (and together have outnumbered baby boomers for several) but single family zoning continues to persist

I, a Millenial with a very active voter record, increasingly do. What seems to be the problem? Perhaps I should point out that representatives still must bring issues to bear, and the age of the average representatives has only very recently dipped into even high Gen X territory. Regardless, if your goal is to spread a little bit of the recent blame around, by all means, don't let me stop you. We should do something about it.