Joseph Nies, 83, of Algonquin.

Police are seeking the public’s help in locating an 83-year-old man, who is possibly in the beginning stages of dementia, after he went missing from Algonquin.

Joseph Nies, 83, was last seen at his residence in Algonquin around 9 a.m. Thursday.

The Algonquin Police Department said Nies has not returned home and has not contacted his family.

The man is believed to be driving a 2010 dark green Lexus LS460 with an Illinois license plate of 1049095.

Nies is described as being 5-foot-5 and weighing approximately 170 pounds.

He has blue eyes, gray hair and a fair complexion.

He was last seen wearing a gray t-shirt, gray shorts and brown Sketcher shoes.

Algonquin Police Department Detective Sergeant Robert Salazar said investigative leads indicate Nies may be in the area of Alton, Illinois or Missouri.

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Salazar said that Nies may be in the beginning stages of dementia and therefore unaware of where he is.

A Silver Alert, also known as an endangered missing person advisory, has been issued statewide.

Anyone with information should contact the Algonquin Police Department at 847-658-4531 or call 911.