Beyblade metal fury roman tome 2 - la décision de kenta (02) (French Edition): Nelvana: 9782821201705: Books: Amazon.com
If ya don't know, it is mentioned in the Manga that Kenta is in 5th grade at the beginning of Fusion. Maybe 11 years old. Besides Ryuga's body being over 100 years
Kenta Yumiya "BeyBlade Metal Series" - Photos | Facebook