Xie Zheng in Pursuit of Jade is generally presented as a young adult , not a teen; the story materials describe him as a marquis-warrior and adult nobleman rather than giving a precise canon age.

There doesn’t appear to be a clearly stated official age in the public descriptions I found, so the safest answer is: his exact age isn’t explicitly confirmed in the widely available summaries.

Quick read

  • Character: Xie Zheng.
  • Status: adult nobleman/marquis-warrior.
  • Exact age: not clearly specified in the public synopsis sources I found.

If you want, I can also help pin down whether the novel gives a more exact age than the drama.