Sigourney Weaver play a teen in ‘Avatar-2’

Don’t call Sigourney Weaver an old lady.

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In fact, the “Alien” actress turned back the clock 59 years to play 14-year-old Kiri in the long-awaited sequel “Avatar: The Way of Water.”

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To convincingly portray a teenager — through the wonders of motion-capture technology — Weaver,

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“I was just sitting on the side [of the classroom] listening to the pitch of the voices: everything from a childlike voice to an adult voice,”

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Na’vi alien Kiri is the daughter of Dr. Grace Augustine, Weaver’s scientist character who was killed in the original 2009 “Avatar.”

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Director and screenwriter James Cameron, who first worked with the three-time Oscar nominee on 1986’s “Aliens,” knew years ago

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