Both claims are about population statistics and demonstrate things which are clearly impossible if you reason about population statistics like you reason about

Both claims are about population statistics and demonstrate things which are clearly impossible if you reason about population statistics like you reason about people. No group of countable persons is younger than they were 30 years ago, nor is any group of countable persons only 6 years older than they were 30 years ago, but people jump straight from "the poorest 90% of Americans are less wealthy than they were in 1987" to thinking a) there is a group of individuals being discussed and b) bad stuff has happened to them. (Neither is true.)