10 August 1965
At the young age of 12 years, 10 months and 25 days, Karen Muir from Kimberley became the youngest world record holder in any sport in the history of organised sport.[i] Karen Muir broke the 110 yards backstroke world record at the British amateur swimming championships in Blackpool on 10 August 1965.[ii] End Notes [i] Karen Muir South African swimming legend, http://swimhistory.org/articles/item/21-karen-muir ↵ [ii] “Tepid Torpedo” Karen Muir remembered, http://www.iol.co.za/sport/more-sport/tepid-torpedo-karen-muir-remembered-1494936 ↵
References

David van Lill, Van Lill’s South African Sports Trivia (Cape Town: Zebra Press, 2005), p. 149.|Former South African swimming great Karen Muir dies at age 60, https://independent.ie/sport/other-sports/former-south-african-swimming-great-karen-muir-dies-at-age-60-29169693.html|Karen Muir South African swimming legend, https://swimhistory.org/articles/item/21-karen-muir|“Tepid Torpedo” Karen Muir remembered, https://www.iol.co.za/sport/more-sport/tepid-torpedo-karen-muir-remembered-1494936