Harry Warwick was last seen on Wednesday 19 December at Abingdon Manor, a nursing home on the Crumlin Road.
Eighty police officers and dozens of Mr Warwick's family and friends have been searching the area, including in country parks and quarries.
Speaking previously to UTV, his nephew Paul Warwick said the family are devastated by his disappearance but are trying to remain optimistic.
A team of six detectives are still working to find Mr Warwick and all sightings are being followed up, police say.
"We have received a number of requests for updates as to the Harry Warwick missing person investigation," a police spokesperson said.
"I can assure you that Harry's family have been kept fully updated throughout this investigation.
"A comprehensive review of all the CCTV in North Belfast continues to take place and even today a search is being conducted by specialists in a water area," they continued.
"We are constantly reviewing what we have done so far and what else can be done in the future in this matter."