Lydia Ko reached the number 1 ranking in women's golf on February 2, 2015. She was 17 yrs, 9 months and 9 days old.
Lydia Ko won her first LPGA Tour event at just 15 years old and a few short years later she won her first major at just 18 years and 4 months of age.
Who was the youngest number one ever in the Official World Rankings for men?
Updated: 24-Jan-2023 | Email feedback to this question
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