The youngest Indian Everest climber award changed hands quite frequently:
May 25, 2014: Poorna Malavath, Telangana. Age at which scaled the peak: 13 years 10/11 months.
She is the youngest Indian Everest Climber.
Source: https://www.thehindu.com/life-and-style/travel/poorna-the-youngest-girl-in-the-world-to-scale-mount-everest-shares-her-story/article28943017.ece
https://www.financialexpress.com/lifestyle/travel-tourism/meet-malavath-poorna-youngest-girl-to-climb-mt-everest-now-scales-peak-in-antarctica/1808621/
https://www.forbesindia.com/article/self-made-women-2020/mountaineer-poorna-malavath-19-is-conquering-stereotypes/58079/1
https://www.washingtonpost.com/lifestyle/kidspost/indian-teen-is-youngest-girl-to-climb-everest/2014/06/09/f2192ce6-ec37-11e3-93d2-edd4be1f5d9e_story.html
https://www.bbc.com/news/world-asia-india-27599570
May 21, 2013: Raghav Joneja, Moradabad. Age at which scaled the peak: 15 years 7/11 months.
Source: https://www.ndtv.com/india-news/15-year-old-boy-becomes-youngest-indian-to-climb-mount-everest-524180
https://economictimes.indiatimes.com/raghav-joneja-15-becomes-youngest-indian-to-climb-everest/articleshow/20422878.cms
May, 2018: Shivangi Pathak, Hisar. Age at which scaled the peak: 16 years.
Source: http://ddnews.gov.in/sports/shivangi-pathak-becomes-youngest-indian-woman-scale-mount-everest
https://www.outlookindia.com/website/story/haryanas-shivangi-pathak-becomes-youngest-indian-woman-to-scale-mt-everest/312071
https://www.amarujala.com/photo-gallery/education/success-stories/chandigarh-shivangi-pathak-becomes-the-youngest-climber-of-mount-everest
May 23, 2010. Arjun Vajpai, Noida. Age at which scaled the peak: 16 years
Source: http://www.arjunvajpai.com
https://www.thehindu.com/news/national/Noida-boy-conquers-Mount-Everest/article16302733.ece