- Vanessa O'Brien
- 52:238 year(s):day(s)
- Not Applicable ()
The oldest woman to climb K2 (8,611 m; 28,251 ft) is Vanessa O'Brien (UK/USA, b. 2 December 1964), who reached the top of the world's second-highest mountain on 28 July 2017 at the age of 52 years 238 days old.
K2 is located on the China-Pakistan border in the Gilgit-Baltistan region of northern Pakistan and Xinjiang, China. O'Brien climbed with the use of supplementary oxygen. She was awarded the title of "Explorer of the Year" the following year by the Scientific Exploration Society for the achievement.