Board Thread:Fun and Games/@comment-30736697-20170330220433/@comment-5741122-20170331211805

Goten and Trunks have always been training. It's not like there was no training at all. And its often theorized that they were able to do it at such a young age because when they were concieved their fathers were already Super Saiyans, thus making it much easier for them to achieve.

And Cabba already had enough power to transform into a Super Saiyan, but he lacked the anger to trigger the transformation.