She is a fitness instructor at 90:
http://www.asahi.com/ajw/articles/14377160
"At the age of 65, she joined a Tokyo gym.
Initially, Takishima couldn’t keep up with other members during group lessons.
Left behind, she worked out and danced in the back. She studied how others moved their bodies and learned exercise routines by following their examples.
For all the challenges, “I never imagined there was such a fun place,” she recalled thinking.
Takishima shed 15 kilograms in weight over the following five years. As a leaner Takishima built up her muscles, she found herself able to do more strenuous exercise routines and became obsessed with workouts.
Takishima learned how to swim at the age of 70. She started taking lessons from a personal trainer after she turned 79."
"Takishima does not follow a particular diet regimen. Instead, her emphasis is on a good breakfast with plenty of fermented food and protein such as natto fermented beans, yoghurt, fish, egg and vegetables.
She mainly eats banana for lunch, but enjoys two glasses of red wine and pre-cooked dishes at night. "