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History Says No 20-Year Stretch in the S&P 500 Has Lost Money Since 1950. Here's What the Worst One Returned.
Source: fool.com
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Across 681 completed 20-year periods measured from month-end closes between 1950 and September 2026, the S&P 500 never finished lower. The weakest span, March 1962 to March 1982, still gained about 61% on price, or roughly 2.4% annually.
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