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Same $500/month. Same fund. 15 years apart. Start at 25 → $3.16M by 65 ($240K invested) Start at 40 → $663K by 65 ($150K invested) The wild part: the early starter could quit at 40 — $90K in, never deposit again — and still retire with $2.5M. Triple the late starter, on $60K less. You can't out-deposit a head start. Math for the skeptics: 10% annual (long-run S&P average — VOO's actual 10-year CAGR is 14.8%, so this is the conservative case), compounded monthly, not inflation-adjusted. Not advice — I just show the math and my real portfolio. What age did you start? 👇 #investing #compoundinterest #voo #sp500 #PersonalFinance