Read the extract given below and answer the question that follow:
Thereafter, Santosh went on an expedition every year. Her climbing skills matured rapidly. Also, she developed a remarkable resistance to cold and the altitude. Equipped with an iron will, physical endurance and an amazing mental toughness, she proved herself repeatedly. The culmination of her hard work and sincerity came in 1992, just four years after she had shyly asked the Aravalli mountaineers if she could join them. At barely twenty years of age, Santosh Yadav scaled Mt. Everest, becoming the youngest woman in the world to achieve the feat. If her climbing skills, physical fitness, and mental strength impressed her seniors, her concern for others and desire to work together with them found her a special place in the hearts of fellow climbers.
Q. At what age did Santosh Yadav scale Mt. Everest, becoming the youngest women in the world to achieve the feat?