True. But that’s income, to be top 10% in your net worth you need 1.5m USD and 12m USD for top 1%
When you're in your 50s or 60s, the mortgage is repaid, and if nothing blew up, you probably also have a million or two in your 401k, so at that point, it's actually not that hard for a person who had a decent career in the SF Bay Area to be worth $4M+. And many FAANG retirees will probably flirt with $10M+ if they don't spend too much.