Ronald Sease was last seen around midnight on Tuesday in the area of Hades Church Road in Antrim Township, according to state police.
Troopers said Sease may be driving a 2013 blue Ford Edge bearing Pennsylvania registration KYB-9247.
Authorities believe Sease may be at special risk of harm or injury.
Sease is described as 6 feet 1 inch tall and weighing about 245 pounds, with gray hair and hazel eyes, police detailed.
Anyone with information about Sease’s whereabouts is asked to call 911 or contact the Pennsylvania State Police Chambersburg Barracks at 717-264-5161.
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