Detective Sergeant Steve Brewer said police feared for Kapeli's safety because his disappearance was out of character.
"He hasn't used his bank account or cellphone and hasn't been in contact with family which is unusual."
A relative told the Herald Kapeli was expected to return from his walk about 5pm but didn't.
Concerned family members had contacted all his friends but no one had seen or heard from him, the relative said.
"He's very gentle. It is out of character so we are concerned he hasn't contacted us."
The family were worried because Kapeli didn't have his cellphone, wallet or a sweatshirt with him when he left for his walk.
Police want to speak to anyone who may have seen Kapeli in the past three days.
Kapeli is 179cm tall and is of medium to solid build.
"He has an affinity to the water and is known to spend hours at or near North Shore beaches or Lake Pupuke," Brewer said.
Anyone who may have seen Kapeli or has information on his whereabouts can call North Shore CIB on 09 4775 261.