Ah, okay, thanks for the clarification! And for the lookalike situation, I meant like how Jiro Wang always has two characters from the same dimension and yet the two aren't twins, unlike how Jack Na plays twins for the most part. Although, the age thing is interesting. Hmm... Wait, now I'm confused on the ages of Ah Xiang, Lei Ting, and Xiao Ci (when considering the placement of the different seasons in the timeline).
Jiro’s characters... are... weird....... Genetically, it’s practically impossible unless his two characters in the same dimension are closely related. However, if we want to talk about the genetic probability of appearances, the whole counterpart thing wouldn’t really make sense, so forget everything we know about biology and pretend like this all works out because of a certain leprechaun in the center of the Earth.
Ah Xiang is 18 in 3anguo and Lei Ting is 17/18 in Re-act; Re-act takes place 10 years after 3anguo, so Ah Xiang is 10 years older than Lei Ting. I think at the end of 3anguo it was explained that Ye Siti found out about his identity around the time of Ah Xiang or Sun Quan’s birth, so Xiao Ci is either a bit older than Ah Xiang or around the same age as Ah Xiang. (Since Remember says that it was Ye Siti himself who killed the original Sun family.)