Son Goten The second child of Goku already showed his talent  at a young age. He was able to turn Super Saiyajin at the age of  five completely surprising his older brother. In a Fusion with  Trunks, Gotenks, they were even able to become Super Saiyajin  3. Unfortunately, due to his lack of discipline, he did not  maintain his ability and had to be "forced" to join the Budokai by  his father.