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She told the Washington Post: 'Age is nothing but a number'.
Mrs. Shepherd has impeccable toned 'six-pack' abs that are the marvel of her Baltimore fitness centre.
Her husband of 54 years, Collin Shepherd, says he 'has trouble keeping guys away from her'.
The Shepherds live in Baltimore with their son, 53, and grandson, 14.
Mrs. Shepherd does some modeling and teaches fitness classes, and told the Washington Post, 'If you are going to try to motivate people, you have to live that part'.
She also trains rigorously with Yohnnie Shambourger, 57, a former Mr. Universe who won the gold medal in bodybuilding at the Pan American Games in 1995.
Mr Shambourger told the Post: 'The six-pack is her signature. When she walks in a room and you see her six-pack, you say, "Ohh! Okay!"
'You are a champion', he told Ms Shepherd during a gruelling session. 'I will train you like what you are."
Ladies I don't know about the rest of you but I'm definitely turning my workouts all the way up!