At 18? Who is starting a family at 18 years old in that climate?
Claude Opus's Fermi estimate of the number of 18 year olds, making at least $100,000 a year, in California, with children, to be about 8 people. Not 8 thousand, not 8 hundred. Eight. Single digit. In a state of 40 million people.
I'll give you even odds that the number is within 4 orders of magnitude of correct. That is to say, in the year of 2025, there are/were fewer than 100,000 18 year olds, resident in the state of California, who have at least one child, and who made over $100,000 that year. If you prove me wrong I'll happily concede the point.
