Although, it's possible there's more brain drain happening from Michigan in general. Living in CO I've met way more Michiganders (and Minnesotans and Wisconsinites) than Iowans. There's probably more disposable income and liberal tendencies that inspires younger people to leave here than Iowans.
There are a lot more Michiganders (and Minnesotans and Wisconsinites) than Iowans overall. I still don't buy that young whites in MI (and NE) voted Biden but those in IA didn't. Not to mention TX/UT/NC, especially as FL/NV go the other way.
CNN has Trump winning the young white vote in Florida by 10 points . I think the CNN white vote by age group makes more sense . I highly doubt Biden won young white voters in any southern states with the exception of Virginia .
Remember this was the overall white vote map in 2016
Southern white voters are very different from non southern white votes and with the exception of FL and VA which are no where as racially polarized as the rest of the south, every southern state probably would vote to the right of Missouri if it’s racial demographics were like the Midwest .
Some of these numbers are not believable, the small white non-hispanic electorate of Miami Dade almost certainly voted for Clinton in 2016, most of anglos people in this county are either gays, jews or socially liberal, college educated professionals.