Andrew Sleight was last seen at around 7.30pm on Monday (December 21) on Elm Grove, Rotherham.
He is described as being 5ft 7, of heavy build with long black hair that is turning grey.
He is also believed to be wearing dark coloured jeans and a camouflage overcoat.
The force said his family are growing increasingly worried about him and his welfare.
Those with information that might help the police, please call 101 quoting incident number 932 of 21 December.
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