Ernestine Shepherd is the oldest competitive female bodybuilder in the world, as declared by the Guinness Book of World Records; as of 2011 she is 74 years old. In addition, she leads exercise classes for seniors and works as a personal trainer. Shepherd had been a model in Baltimore for years, but at age 56 she and her sister went to try on swimsuits and found their bodies were out of shape; they then started taking aerobics classes. Since age 56 she has won two bodybuilding titles, as well as run nine marathons. - Wikipedia
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