Frisk's exact age is not explicitly stated in Undertale, but they are generally considered to be a child likely between the ages of 9 and 13. Various in-game characters refer to Frisk as a kid or child, and their abilities such as writing suggest they are at least around 9 years old. Frisk is also depicted as being too old for toys, which aligns with a preteen age range. Some sources estimate Frisk to be about 11 to 13 years old based on their behavior and skills, while others place them slightly younger, around 9 years old
. Overall, Frisk is portrayed as a young child, not a teenager or toddler.
