Grandson Richard Bloemendal said Mrs Hanlon spent the last four months of her life living in a rest home, where she would play the piano for the other residents.
Before that, she had lived independently since her husband Harry's death in 1999, catching a taxi into town to do her shopping, doing her own cooking and washing and tending to her garden.
Mr Bloemendal said that apart from a bout of food poisoning this year, his grandmother had never been seriously ill or had any surgery.
"The only medication she was on was an iron tablet, and that was under duress," he said.
"Apart from losing a bit of short-term memory, as you're entitled to do at that age, she still had her lights on."
Mrs Baguley, who still lives by herself at her Waiuku home, said it would be strange without her twin, whom she last saw during a visit to the rest home about three weeks ago.
"But you have to learn to live with it. It's one of those things that comes to everybody," she said.
She credits their longevity to "good genes", saying two other siblings lived into their 90s and three others well into their 80s.
Mrs Hanlon married Harry and moved to Papatoetoe in the 1940s, around the same time as Mrs Baguley and her husband shifted to Waiuku.
"She was a townie and I was always a country bumpkin but I would say we both have had very good lives," said Mrs Baguley.
"Life is always what you make it yourself."
Mrs Hanlon spoke to the Herald in 2009, just before the twins celebrated turning 100.
She said then that the secret to a long life was about keeping things simple.
"I've had the odd shandy to be sociable, but that's it. I've never been drunk. I'd probably get in trouble if I did," said Mrs Hanlon.
"Oh, and I have never smoked cigarettes. They're just awful."
Mrs Hanlon outlived her daughters Aileen and Shirley. Son Brian survives her.
Mrs Hanlon's funeral service will be held this morning at the Manukau Memorial Gardens Crematorium in Papatoetoe.
