Compound interest is truly the eighth wonder of the world! I only started to understand that recently.
I like to play around with a compound interest calculator for fun while torturing myself with the pain of regret.
I would be a millionaire by now just by putting money in an index fund if had started it when I was younger.
If I had an initial investment of $10,000 and kept adding $10,000 annually with a typical 10% annual rate of return from an index fund, I would hit a million in about 24 years.
For any math enthusiasts out there, you might like playing around with the compound interest calculator here:
Compound Interest Calculator - Daily, Monthly, Yearly Compounding (thecalculatorsite.com)
Behold the wonders of compound interest!