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>>8277105(lb)
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I dont know if there are other clues in the original IJ script, but Lucas' concept for Marion was she was eleven. years. old. "Maybe 12." as he says.
https://v1.escapistmagazine.com/forums/read/7.97368-Indiana-Jones-Was-Almost-A-Sex-Offender
According to the (later) novelization of the film, it gave her age as 15. Public wouldn't stomach? Still illegal Indy.