Although a 14-year-old has an average IQ of 100, most tests classify someone with a score between 90 and 109 as having average intelligence. As of 2014, the majority of IQ tests compare test takers to others in their age range and use 100 as the benchmark score.
Most children’s IQ scores after turning 10 remain constant, although some life circumstances could affect the child’s score. Sometimes, providing for a malnourished child’s food needs improves his test results. IQ tests do not contain all the data necessary to forecast a person’s likelihood of success or failure.