Connie Dennison is set to take the Guinness World Record title from a Canadian woman, 96-year-old Ida Herbert, reports Scotsman.com.
Dennison started practicing yoga, which aims to work on the body and mind, whilst living in Melbourne, Australia when she was in her 20s and for the past 40 years has held a class at the same Dunfermline church.
Dennison, who delivered food across the UK during the Second World War, is said to always start her class at 10am sharp and begins with relaxation techniques, followed by a number of different moves.
Pupil Sophia Henderson, 88, said: "We would love Connie to be in the Guinness World Records, it would be wonderful for her."
Dennison has handed down her yoga techniques to three generations of her family and said it is keeping her young.
She explained: "I'm quite sure that I'd be in a wheelchair if I didn't have yoga.
"My lefts have been stronger since I started and it has helped me and my family."
Guinness World Records have unofficially confirmed that she appears to be the world record holder.
A spokesperson said: "Guinness World Records is extremely happy to hear about Mrs Dennison's achievement."