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Can saving/investing 15% of your income starting age 25, likely make you a millionaire?
I just want to point out a couple of things, and I do not have enough reputation to comment. Saving 50% is totally possible. I know people saving 65%. For more see here EDIT: Let me repeat that 4% it the maximum you can assume if you want to be sure to have at least that return in the long term. It's not the average, it's the minimum, the value you can expect and plan with. Just to reinforce the claim, I can cite Irrational Exuberance of Robert Schiller, who explicitly says, on page 135 of the 2015 edition, that from January 1966 to January 1992 the real annual return was just 4.1%. Sure, this does not matter so much if you are investing all the way through, but it's still a 26 year period.