About Karen Muir
Karen Muir was a South African competitive swimmer. Born and raised in Kimberley, she attended the Diamantveld High School, where she matriculated in 1970. On 10 August 1965, aged twelve years,Karen Muir became the youngest person to break a sporting world record in any discipline when she swam the 110 yards backstroke in 1m 08.7s at the ASA National Junior Championships in Blackpool, England. She also won 22 South African Championships and three US National Championships. Over the following five years Muir would go on to set fifteen world records in the backstroke at 100 metres, 200 metres, 110 yards, and 220 yards.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.