Recalling the first time they met, Wakeford said he had found Wallbank "a real pleasure, believe you me - a real pleasure".
Wakeford has three children, eight grandchildren and 11 great-grandchildren.
Wallbank has four children, nine grandchildren, and 13 great-grandchildren.
Mary died 20 years ago on September 13. Isabel died about 10 years ago.
Wallbank met Mary at a cabaret when he was in the Navy. Wakeford met Isabel when he was cycling down 13th Avenue eating an ice cream - "acting a fool", he said.
Both men served in the defence force during World War II; Wallbank as a sailor, and Wakeford in the Air Force fixing planes.
After serving in the war, Wakeford was given land for a dairy farm in a post-war ballot. He and Mary lived on their farm in Te Puke after moving from Auckland when he left the Navy.
Wakeford started a business fixing vehicle chassis, which is still running to this day in Tauranga.
Asked for tips on getting to 100, Wakeford said to "keep eating".
Also present was their niece Dianne Temple, whose mother Eileen was the sister of Mary and Isabel.
The joking continued as the pair were taking photos - directed to look at each other, Wakeford said Wallbank had to do it "whether you like it or not".
"Can I sue you for damages if they don't look nice?" Wakeford asked.