There’s no info about the actual age of Genshin characters, but some people speculated their age based on their appearance, which currently there’s 3 types of them in the game:
- Kids types: Between 8–12 y/o.
- Teens types: Between 15–18 y/o (this is the range of Bennett’s age).
- Young Adult types: Between 22–25 y/o.
Of course, there are some exceptions, where some characters was much older than their appearances, like Zhongli, Venti, Xiao, Dainsleif, and both Travelers.