When asked if
Harrison Ford was too old to return as Indy, producer
Frank Marshall quoted
Raiders of the Lost Ark (1981): "It's not the years, it's the mileage." He explained that it would be interesting to see Indy in a different decade, and deal with all kinds of new and interesting things. The age also adds to Indy as a fallible and therefore believable character. Ford spent three hours a day at the gym, and subsisted on a high-protein diet of fish and vegetables, thus building his body into a condition where he could perform his own stunts (he always kept himself fit anyway, as he hoped to complete all the five Indiana Jones films that were originally planned in the 1980s).
Steven Spielberg later stated he was so impressed with Ford's form that he could not tell the difference between the shoots for the third and fourth films.
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