The family of missing North Shore man William Davies are making a desperate plea to the public to help bring their dad home.
Mr Davies, 74, went missing on Wednesday from his Albany rest home and has not been seen or heard from since.
His sons, Stephen, Glenn and Greg, say Mr Davies is a treasured father and grandfather and they want him home safely.
Mr Davies suffers from PSP, a condition that affects his mobility, balance and ability to think clearly.
It is likely by Thursday he would have become unwell and immobile.
Greg says the weather this week would have made for pretty undesirable conditions outside, and he fears his father is in trouble. "It's been nearly four days with some pretty awful weather that no man of Dad's age or medical condition should be wandering about in. He'll be disoriented and confused, if not injured and suffering somewhere. My brothers and I want to find him and we need help."
Greg says there is a chance his father has caught a bus into Auckland City and gone to familiar football grounds after he left his home.
"The SUB Football league competitions used to be held at three main venues – the Domain, Walker Park (Pt Chevalier) and Seymour Park (Epsom). He may have been trying to get to one of these locations and may have encountered someone along the way and engaged them in a discussion about the sport he was passionate about."
Search and rescue volunteers along with police have been scouting potential spots he may have gone to since Wednesday, but need people who may have seen him to come forward so they can narrow down their search area.
Medical experts are warning Mr Davies' condition may make him look as though he is intoxicated, homeless or in need of attention.
Before he disappeared he was last seen wearing a blue polar fleece, dark track pants, a black shirt and sandals.
Anybody with information should contact North Shore police immediately on (09) 477 5261.