Five-year-old Jaime performs on an intelligence test at a level characteristic of an average 4-year-old. Jaime's mental age is:

Jaime's mental age is defined as the typical age at which the average child demonstrates the same level of cognitive ability or intelligence. In this case, since Jaime, who is 5 years old, performed on the intelligence test at a level characteristic of an average 4-year-old, this indicates that her cognitive functioning aligns with the developmental milestones typically seen in a 4-year-old child. Therefore, her mental age is reported as 4 years old, reflecting the standard at which her abilities are assessed relative to her peers. The concepts of mental age and chronological age are often used to evaluate cognitive development and intelligence, particularly in children.