In response to the OP:
Take out student loans and work in finance/tech/law/consulting/medicine in a HCOL city, and voilà, you're making six figures. This is a pretty stupid thing to do IMO, but it's an almost surefire route to +$100k if you're fairly intelligent and hard working.
Personally, I went to law school, took out huge loans to do so, and make a lot more than $100k while living in a HCOL city. It is easily the worst decision of my life. Prior to law school, I was debt-free and living a Mustachian life before MMM (the blog at least) existed. I was saving +50% of take-home pay on a $35k salary fresh out of college. Had a 401(k) but wasn't maxing it out admittedly. Now I'm a debt slave who has to work long hours at a stressful but boring job. And some odd circumstances have caused my student loans to balloon out of "reasonable amount to pay off" territory.
My friend who got kicked out of law school after his first year is in *way* better financial shape than me, LOL. He had a rough go for a few years, then found a sales job and is killing it. He has a rental property and an AirBnb property along with $150k - $250k salary for about 30 hours of work per week, nearly all of it from home.
The point? Find a way to make "+$100k" that doesn't involve trading time for money. That's a sucker's game, especially if your personality is the type that draws you to Mustachianism. I know a few people who truly live to work and relish spending 60+ hours a week in the office, but few people can maintain that for very long, and really, why would you want to? Start a business, buy assets, learn sales, etc.