Xiao, a character from the popular video game Genshin Impact, is an Adeptus, a being with a lifespan far exceeding that of humans. While his physical age is ancient, his mental age is a bit more complex.
Xiao's mental age is difficult to pinpoint definitively because he has lived for centuries, experiencing both immense joy and profound sorrow. His personality reflects his long life, with a stoic and reserved demeanor, often showing a lack of interest in mundane human affairs. However, he also displays moments of vulnerability and tenderness, particularly when interacting with those he cares about.
Given his vast experience and wisdom accumulated over centuries, some might argue that Xiao's mental age is far beyond that of any human. However, his emotional maturity and understanding of the world are not necessarily tied to his physical age. His experiences have shaped him into a complex individual with a unique perspective on life.
Ultimately, Xiao's mental age is subjective and open to interpretation. It is up to the individual player to decide how they perceive his character and how they interpret his actions and motivations.