Until they all die off? Go read about the pizzagate incident. The guy who fired a rifle inside that restaurant was 28 years old. Alex Jones, the lying asshole who runs infowars, is in his mid-40s. The alt-right is full of men in their 20s-40s.

The problem in this particular case isn't old people. If you want to point at one broad demographic, it's men, largely under the age of 50.