Yes just index funds, making about $200k/year pretax if I count salary+stock+bonus+401k match.
I'll admit, not everyone makes $200k this early. But most people could be financially independent much sooner than they think if they realized that spending doesn't make them happier and started saving instead -- so I suggest this when I get the chance. :)
Lots of people have no idea where their money is going because they don't track spending.