Thanks, @sidehustle4life!! I don't have a side hustle yet, although I am working on a few things. I'm trying to build up my network and customer base before spending too much time on monetization.
I was able to save that much by being a decent saver - definitely not a super saver compared to some in the FI community. I started out saving 8% and quickly grew that percentage to max out my 401(k) by age 27 or 28. Finally, I do have a fairly lucrative career, which does help save extra money.