A Silver Alert has been issued for a missing Bay Shore man with dementia, police said.

Fredrick Eaton, 81, was last seen at his Reilly Street residence at about 8 p.m. Monday night, Suffolk County police said.

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“He is believed to be on foot,” police said in a statement. “Eaton is white, 5 feet 8 inches tall, thin with blonde hair and blue eyes. He was wearing a blue jacket with the letters USA.”

Anyone with information on his whereabouts is urged to call Third Squad detectives at 631-854-8352 or call 911.

Silver Alert is a program “that allows local law enforcement to share information with media outlets about individuals with special needs who have gone missing,” police said.