Excerpts from "The Shape of the Essay Field" https://paulgraham.com/field.html
So the three reasons readers might not already know what you tell them are (a) that it's not important, (b) that they're obtuse, or (c) that they're inexperienced.
so by implication,
If you're writing for smart people about important things, you're writing for the young.
Now that I know it, should I change anything? I don't think so. In fact seeing the shape of the field that writers work in has reminded me that I'm not optimizing for returns in it. I'm not trying to surprise readers of any particular age; I'm trying to surprise myself.