Louis Stickler was last seen leaving an address in Calne at around 4.30pm yesterday afternoon.
He is described as white, around 5ft 8ins tall, with a white beard, balding on top with white hair on the sides of his head. He was wearing blue shorts, a pink/red cap and sandals. He has a muscular build and a bit of a tummy.
Police said: "Concerns are growing for his welfare and we would urge anyone who has seen him or who has any information about where he might be, to please call us."
Anyone with information should call 101/999 quoting log 64 of today.