

It’s more that older skew conservative, so a boomer is more likely statistically to be Republican, and they are also more likely to physically be able to vote in person, between the attacks on mail voting and election day not being holiday so most people 18-65 are working.
That said there exist younger fascists, but they are (a very vocal) minority of younger generations.
Others are disconnected from politics in ignorance or lack of time to pay attention.
The propaganda machines have been doing great work for fascism for the last 50 years

TBF, that last part about younger may be projection/my own echo chamber, plus I live on opposite side of country in an urban area.