"He could have been there for weeks."
Dunedin police were still trying to contact the man's next of kin last night.
The body was taken to the Dunedin mortuary last night and the matter had been referred to the coroner.
The cause of death was not believed to be suspicious.
The man had been living in his own house in Caversham, Mr McLellan said.
"Unfortunately, we have people living alone that don't have family contact or people checking on them.
"It's a reminder that if you've got elderly residents next door and you haven't seen them for a while, it's a good idea to give police a call.
"We're happy to check on their welfare," he said.