Police say a 69-year-old man who went missing from a retirement home in Ajax, was spotted over the weekend but has still not been found.

Police say Robert Parker first went missing from a residence on Station Street last Friday morning. He suffers from dementia.

They say several witnesses reportedly saw Parker in Ajax this weekend, but he remains missing.

Parker is six-feet tall with a slim build, facial hair and is balding with short brown and grey hair on the sides.

He was last seen wearing a beige T-shirt, navy track pants and a black baseball cap with a red Canadian flag on it.

Durham regional police want to hear from anyone with information about Parker's whereabouts.

(Canadian Press)