"I don't think I've ever woken up and thought 'I don't want to go to work today'.
"No-one's ever said 'why don't you retire?' or 'haven't you had enough?'"
Mrs Summers began work at Saunders in August 1950, having answered an advertisement in the newspaper.
Her original plan after leaving school was to train as a nurse -- but her family discouraged her from pursuing a high-pressure career, as her health was weakened from a childhood bout of diptheria.
"I was just looking for a job, any job."
Back in those days, she said, shoes came in "brown, white, navy and black -- and that was it."
"You didn't get the variety we have these days. All the shoes were manufactured in New Zealand, which doesn't happen now -- I've seen a few brands go off the shelves completely."
When fitting a shoe, Mrs Summers advises customers to chose "comfort over looks".
"If it's not on them right, I'll say so.
"If we sell them a shoe which isn't the proper fit, they won't come back again."
One of the best parts of the job is knowing she has helped a customer find "their perfect match".
"People will buy new shoes for a special occasion, like a wedding, and they'll come back and show you photos of them, all dressed up."
Saunders outlet store manager Amanda Sim said working with Mrs Summers is "an inspiration".
"She remembers everyone's shoe sizes, what shoes they like, who their grandmother was. We have customers who come in just to see her."
"You do meet some lovely people -- I think I'm on to serving my first customers' great-grandchildren now," Mrs Summers said.