The police were alerted by relatives at half past five in the morning.
Since then, several police patrols have searched for the man without success.
It is about an 80-year-old man with a normal build, gray hair and a white beard.
According to the police, the man should move unsteadily and possibly walk with a cane.
Shortly after 10 a.m., a helicopter joined the search effort.
The police should also have contacted local traffic and taxis.
At lunchtime, the police went out with information that drones and dog patrols have also been deployed in the search.
Missing People also enter and start looking for the man during the afternoon.
The police urge the public to call 112 if any observations are made.
The article is updated.