I think some dudes in here never watched the show or at least forgot some things over the years.
Gohan was always trying to sneak away and train as a youngin. Chi Chi was the one that had him on lock down with the books. He just got older and ended up embracing his inner nerd. This was when the world was at peace. Same with Goten and Trunks. They were kids too and had fun fighting. They just had more freedom than Gohan did with the world being at peace more. If you count the last ep of DBZ and that God forsaken GT series, they still fought, but weren't as into it and involved in other stuff. Goten had a girlfriend and Trunks got into cross dressing.
There's also that bullshyt theory that Goten and Trunks became SSJ so early cuz they had "SSJ genes" due to their fathers already achieving the form when they were born. But that deserves it's own thread
We all knew Toriyama made em so strong so they can introduce fusion
Now in this new series, if we see Goten and Trunks grow up and still thirsty for battle, then yall nikkas might be onto to something.