lunabee34

I don't want to spoil you too much, but I will just say that Dixingren have different life spans than human beings, and Lao Chu is older than 35.

The fandom says that Zhao Yunlan is 28 based on his birthdate on the paperwork Shen Wei is looking at (I think).

Shen Wei says he is 32, but ... see above re: Dixingren and also his entire life in Dragon City being a cover lie, so .... Guo says how old he is to Zhao Yunlan in the first episode but I can't remember - very early 20s is all I recall.

For the rest of them I don't know that we ever learn their ages.