South Yorkshire Police officers are appealing for the public’s help to find the man, named only as John.
Hew was last seen leaving his home address in the Bessacarr area of the town shortly after 4pm on Saturday, December 4.
He is white and described as around 5ft 6in tall and of slight build. He was last seen wearing a waist-length navy blue rain coat with a hood on, black trousers, grey trainers and a green chequered-style flat cap. He walks with the use of a stick.
Officers are becoming increasingly concerned for John's welfare and want to speak to anybody who has seen him.
Have you seen him? Do you know where he might be? If you have any information which may help police enquiries, please call 101 quoting incident number 631 of 4 December.