There are a lot of folks in California who don't make $160K/year. Maybe your son and wife really can't do anything. But do they have cable? Do they buy new cars or used? Do they have the latest cell phones and the expensive plans?
In some ways it was so much easier starting out in the '70s. Credit cards were not ubiquitous. If you wanted something, you saved up for it. Your first car, most likely, was used. Monthly cable bills? Monthly cell phone bills? Unheard of.
(Of course, when we bought our first house in 1980, our FHA mortgage was 14%.)
Of course they do ...this is the 21st century.
They live comfortably and are raising two wonderful boys who do not go to government school. -- The irony is they both work for the state. My son is a Fire Department Captain. his wife a lobbyist for CPS. They feel a calling as did I when I was younger.