Friendly reminder that BSB 2002 and BSB G-Revolution take place in the same year. The boys only get older by one year throughout the three seasons.
Which means, if Takao is 11yo in JPN S1, he will be 12 in S2 and S3. If he is 13 in US S1, he will be 14 in S2 and S3.
Proof:
Beyblade Rising (Japanese) states that it takes place roughly one year after G-Revolution. So Takao is now 13.
EDIT: I'm still browsing the episodes to find the exact screenshots, but I clearly remember that somewhere in S1 it is stated that they're in shōgakkō. In 2002 and G-Revolution they're in their first year of chūgakkō (12yo).
EDIT #2: Now that I think about it, a lot of us (including myself) often complained with the fact that the guys were drawn terribly short compared to the adults, just like in that picture on the newspaper -- which would be strange for 15 year olds -- but considering that they're preteens in JAP, it makes much more sense. That, and the choice of seiyū!
Dark Lightning // ❝ You forgot about me did you? I'll make sure you never forget me again! ❞
他是雷电交加和大雨磅礴 她是饮尽暴风的地球之花。~ R x H
爱上你的时候 还不懂感情 // 离别了 才觉得刻骨铭心 // 原来你是 我最想留住的幸运
可我也失去 为你泪流满面的权利 // 她会有多幸运