In the original trilogy, the young Luke Skywalker accomplished in a couple years what would take most Jedi decades.
Luke’s father Anakin trained in the arts as a young boy all the way through to adulthood. Luke was almost a young adult when he started. Looking at just how short of a time he spent under Yoda’s tutelage, it’s actually impressive he was able to defeat Vader and avoid Palpatine’s dark side temptations…
There’s certainly a possibility that after the original trilogy, Luke has become even more powerful then Yoda…

Viral Killer