Share your insights or perspective on the financial matter presented in the input.

Can saving/investing 15% of your income starting age 25, likely make you a millionaire?
Yes, becoming a millionaire is a reasonable goal.  Saving 15% of your income starting at age 25 and investing in the stock market will likely get you there. The CAGR (Compound Annual Growth Rate) of the S&P 500 over the last 35 years has been about 11%. (That 35 years includes at least two fairly serious crashes.) You may get more or less than that number in the future, but let's guess that you'll average 9%. Let's say that you begin with nothing invested, and you start investing $100 per week at age 25. (If your annual income is $35,000, that is about 15% of your income.)  You decide to invest your money in an S&P 500 index mutual fund. 35 years from now when you are 60 years old, you would be a millionaire ($1.2 Million, actually). You may earn less than the assumed 9%, depending on how the stock market does.  However, if you stick with your 15% investment amount throughout your whole career, you'll most likely end up with more, because your income will probably increase during your career.  And you will probably be working past age 60, giving your investments time to earn even more.