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インデックスファンドの歴史は50年に少し足りない。
世界初のインデックスファンドはVanguard 500で、1976年8月31日から

A Brief History of Indexing

https://www.morningstar.com/articles/390749/a-brief-history-of-indexing

For those unfamiliar with the history of index funds, Bogle's Folly is the Vanguard 500 (VFINX), the world's first index mutual fund.

On Aug. 31, 1976, it launched as the First Index Investment Trust with little fanfare but soon attracted much derision for its central premise: That just buying and holding the broad stock market would provide better results than trying to beat it by picking stocks.