...and then there's the Zoomers! Seriously is anyone under 40 a Republican?
There are under-40 Republicans, but you won't find any Republicans under about 28 or so. I know exactly one in real life, and I've literally never lived anywhere other than very white middle-class suburbs in solidly Republican states.
Also, I think the high Democratic turnout of the last few years won't go away when Trump is gone. For a long time we will be very determined to not let another Trump happen.
How is this possible? I know several young middle class people in Macomb and Oakland counties in Michigan (neither are "solidly Republican" and both are basically evenly split) and know a lot of young Republicans (and Democrats). How old are you?