Ciska Jansen
Franciska Johanna "Ciska" Jansen is a retired Dutch track and field athlete. She competed at the 1976 Summer Olympics in the long jump and finished in 18th place.
After she reached age 40, her 6.21m jump exploded the world record for her age group, besting the previous record by Australian Olympian Helen Searle by 52 cm. For point of comparison, Bob Beamon's record improvement was 55 cm. Her record would stand for almost 15 years.