At risk of seeming super-whitebread

[Verily]

Retired families also often continue to live in their neighborhoods (although of course many move to Fort Lauderdale, Phoenix, San Diego, etc., too), and they bring down the median household income despite having low living expenses (no children to raise, mortgage paid off, etc.).

Anyway, I can sympathize. I would never have considered my family rich as a child, but our household income was somewhere around $250k. Living expense account for some of it, of course; Bergen County is one of the most expensive places to live, regardless of income, in the country, up there with the Bay Area. But still.

[Verily]

My mom actually makes more than my dad. I wonder what percentage of couples that applies to.

My parents, at least. My mother had more than double my father's income (around $175k to his $75k) before they semi-retired. But he worked for the government, so he got all the health coverage and whatnot for the family.