Thread:KrytenKoro/@comment-35109290-20180716165043/@comment-134861-20180717191728

Unfortunately, while all of this would make sense if the canon was consistent about the ages and grades, it is not. The various sources have made it clear that, whichever rules are being followed for rules and grades within the Digimon setting, they do not match the real world. Therefore, it would be inaccurate to claim any ages or grades based on real-world estimates. This is also emphasized in the editing window, which states "All edits must be sourced to published material".