Then at the age of 12 years, four months and 25 days he rewrote history with a win over the Indian Grandmaster Leon Mendonca at an event called the Vezerkepzo GM Mix.

The youngster had already achieved the other criteria of crossing the required 2500 Elo rating barrier.

The previous record, which American  Mishra beat by 67 days, was held by Sergey Karjakin for 19 years.

https://chess24.com/en/read/news/what-it-takes-to-be-the-world-s-youngest-grandmaster

Video of American Mishra taking about his ne record. https://www.youtube.com/watch?v=JY2KaqFRNn8&t=57s