Results of tournament since it started in 1988 are given below.
India has won this 5 times (2000, 2008, 2012, 2018 and 2022) besides being runners-up in 2006, 2016 and 2020.
https://en.wikipedia.org/wiki/Under-19_Cricket_World_Cup#Results
It is interesting to look at the team sheets of the winners and runners-up to see if the prominent players at the under-19 level did well at higher levels. For instance, Mohammad Kaif and Yuvraj Singh played for India in 2000. Yuvraj was the player of the tournament here.
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