She's always stayed healthy by eating food grown in her garden and taking a spoonful of castor oil every day, her granddaughter says.
And there's a history of reaching a grand old age in the family.
Two of Mere's siblings reached 103 and 104 and another died at 95.
Sha always remembers her grandmother keeping fit by riding her bike to the shops and other spots around South Auckland because she never learned to drive. "She'd have three shopping bags on each handle and a sack of potatoes on the back with four of us following behind."
But just because she's never driven doesn't mean Mere can't find her way around.
The family wanted to visit the grave of Mere's parents on a trip to Wairoa two years ago.
"They're buried in a paddock and we went the wrong way but she said: ‘Go the other way'," Sha says. "Nana knew how to get there."
Mere now lives with Sha, who says it's fantastic to get the chance to look after her grandmother after she did so much for her.
"It's what I always tell her: ‘You looked after me when I was young, now it's my turn to look after you'."
Mere has a total of about 80 children, grandchildren, great-grandchildren and great-great grandchildren.