Rita Wilson was last seen at about 7:30 a.m. at her home in the Clinton County town of Redford, which is about 22 miles from Plattsburgh, police said.
State Police said Wilson has dementia, and her family is concerned for her welfare.
She was last seen wearing a red jacket with the word "Cortland" on it, blue jeans and loafers.
She is described as being 5-foot-3 and 128 pounds, authorities said.
State Police asked anyone with information to contact authorities at 518-873-2777.
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