Christopher Miller is believed to have driven a silver Porsche Boxster through Dartford, near the junction of Princes Road and Watling Street, before he went missing on Sunday, May 12.
The 66-year-old was last seen at around 6.30pm on May 12 in the London Road area.
However, officers believe he may currently be in or around Northfleet.
Christopher is described as being white, bald, with hazel eyes.
Officers are appealing for help to find a 66-year-old man missing from #Swanley
Read more on our website: https://t.co/j1YLcGfX8u pic.twitter.com/oJ5kolkA2v
— Kent Police (UK) (@kent_police) May 13, 2024
He has a medium build and is about five feet five inches tall.
The pensioner was last seen wearing a burgundy and navy striped jumper, a navy blazer jacket, brown denim trousers and brown boots.
An appeal post on Kent Police’s Facebook page said officers are becoming “increasingly concerned” for Christopher’s welfare.
Anyone who has seen Christopher Miller or knows where he might be should call 999, quoting reference 13-0244.