Question: how old are the yugioh characters?
Answer: Original series were all 14 or 15 (I know Kaiba was 16 by the end). GX they started at 14 and ended at 18. 5D's Yusei and Crow were 18 and ended at 19, Jack was 19 and ended at 20, and Aki was 16 and ended at 17. Everyone in ZeXal was in Jr.