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It was reported earlier this month that Eastwood was planning to make one final movie about the iconic character.
However, the veteran actor, who last played Harry Callaghan in 1988's The Dead Pool, claimed he was too old to bring back the San Francisco cop.
"It would be highly unrealistic," Eastwood told Empire. "People have asked me over the years 'would you like to revisit Dirty Harry?' But everything would depend on a script.
"But, really, no. There's a time to leave things alone."
He added: "I don't think the San Francisco Police Department would have a 77-year-old man on the police force."
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