Police stopped their official search a week after his disappearance, but family and friends have continued to search every day for their beloved father and grandfather.
The Hamilton man had mild dementia and had been described as frail.
Stirling was known to hitch a ride from time to time.
It's unclear how far from his home his body was found, but family confirmed it was their search group who made the discovery.
Stirling's granddaughter Marina Rameka told Newstalk ZB that between 50 and 100 people had been helping with the search.
"He has a really big family, who care about him immensely," she had said.