Looks like its the Young and the Old vs the Middle Aged in Iowa.
18-34: Biden +20
35-49: Trump +12
50-64: Trump +4
65+: Biden +25
Okay (unironically) Boomers!
It's possible that the 76+ Silent and Greatest Generation members are responsible for most of that margin.
Doubtful simply because there are a lot fewer of them.
It makes sense that older boomers would be more Democratic than younger ones though. They were the ones who came of age during the Civil Rights movement, Vietnam/peace movement, Watergate, etc. Younger boomers came of age during the Reagan era, as did Gen X. In some ways the older boomers have more in common with the silent/greatest generations than they do the younger boomers, who have more in common with Gen X. The Boomer generation is so long that it covers perhaps too wide a range of years to be of much use in predicting people’s views.
