Average IQ for Teenagers (Ages 13–17)
Typical IQ Range
90–110
Age-normed average is always 100
IQ and Teenagers (Ages 13–17)
The teenage years represent a critical period for cognitive development as the prefrontal cortex — responsible for planning, decision-making, and impulse control — undergoes massive restructuring. IQ scores begin to stabilize during adolescence, with scores at age 15–17 being much more predictive of adult IQ than childhood scores. Teenagers show rapid development in abstract reasoning and fluid intelligence, which typically peaks in the early-to-mid 20s. The WISC is used until age 16, after which the WAIS (adult version) becomes appropriate.
For a full explanation of how IQ scores work and what they measure, see our complete guide to IQ. To understand what different score levels mean, check our IQ score ranges page.
Key Factors Affecting IQ at This Age
Teenage brains are uniquely sensitive to environmental influences, both positive and negative. Sleep deprivation (extremely common in teens due to early school start times and screen use) can reduce effective cognitive performance by 5–10 IQ points. Substance use, particularly cannabis and alcohol, can impair cognitive development during this critical period. Conversely, challenging academic work, physical exercise, and learning new skills can enhance cognitive development. Social media and digital multitasking may negatively impact sustained attention and deep thinking.
IQ Across the Lifespan
| Age Group | Typical Range | Key Trend |
|---|---|---|
| Children (Ages 6–12) | 90–110 | Rapid development, high variability |
| Teenagers (Ages 13–17) | 90–110 | Stabilizing, prefrontal cortex developing |
| Young Adults (Ages 18–25) | 90–110 | Fluid intelligence peaks |
| Adults (Ages 26–50) | 90–110 | Most stable period |
| Older Adults (Ages 50–65) | 90–110 | Knowledge peaks, speed declines |
| Seniors (Ages 65+) | 85–105 | Crystallized stays, fluid declines |
| Age 5 | 90–110 | |
| Age 6 | 90–110 | |
| Age 7 | 90–110 | |
| Age 8 | 90–110 | |
| Age 9 | 90–110 | |
| Age 10 | 90–110 | |
| Age 11 | 90–110 | |
| Age 12 | 90–110 | |
| Age 13 | 90–110 | |
| Age 14 | 90–110 | |
| Age 15 | 90–110 | |
| Age 16 | 90–110 | |
| Age 17 | 90–110 | |
| Age 18 | 90–110 | |
| Age 19 | 90–110 | |
| Age 20 | 90–110 | |
| Age 21 | 90–110 |
Frequently Asked Questions
What is the average IQ for a teenager?
The average IQ for a teenager is 100, the same as any age group, since IQ tests are normed by age. About 68% of teenagers score between 85 and 115. Teenage IQ scores are more stable than childhood scores and begin to predict adult cognitive ability more reliably.
Does IQ change during puberty?
Yes, IQ can shift during adolescence. Research from University College London found that some teenagers' IQ scores changed by up to 20 points over a 4-year period, with corresponding changes visible in brain structure on MRI scans. Both increases and decreases were observed.
How does sleep affect teenage IQ?
Profoundly. Teenagers need 8–10 hours of sleep but average only 6–7. Research shows sleep-deprived teens perform as if their IQ were 5–10 points lower. Chronic sleep deprivation during adolescence may have lasting effects on cognitive development.
Explore Other Age Groups
Take our free IQ test to see where you stand, or learn how to improve your IQ at any age.
MyIQScores Editorial Team
Researchers in cognitive psychology, psychometrics & educational science
Last updated
May 10, 2026
All content on MyIQScores is reviewed for scientific accuracy against peer-reviewed research in cognitive psychology and psychometrics. Our editorial team cross-references each article with published literature before publication and updates pages whenever new research warrants a revision.