What Is The Average IQ Score By Age? (2024)

Ever wondered what is average IQ score by age globally? Or how is IQ even calculated?

IQ, or Intelligence Quotient, is a measure of cognitive abilities that has been used for over a century to compare individuals’ intelligence levels. However, IQ scores are just one measure of intelligence and cannot fully capture the complexity of human cognition. 

In this article, we will explore the concept of IQ, how it is calculated, and the factors that can influence IQ scores. We will also discuss the average IQ score by age and how it reflects the ongoing development and maturation of the brain. 

Additionally, we will explore the Flynn Effect and its implications for our understanding of IQ and intelligence testing. 

Let’s get started. 

What is the Average IQ Score by Age?

There isn’t any firm data on average IQ by age available on the internet. However, we found some information on IQ scores of certain age groups from reliable sources. Here is the breakdown of the average IQ score by age:

Age Group Average IQ Score
15 – 17 years old108 
18 – 20 years old105
21 – 24 years old100
25 – 34 years old98
35 – 44 years old101
45 – 54 years old107
Over 65 years old114
Average IQ Score by Age

IQ Score Distribution

IQ scores are distributed along a bell curve, with the majority of individuals falling within the average range. Here is a breakdown of the IQ score distribution:

  • Very Superior (130+): 2.2% of the population
  • Superior (120-129): 6.7% of the population
  • High Average (110-119): 16.1% of the population
  • Average (90-109): 50% of the population
  • Low Average (80-89): 16.1% of the population
  • Borderline (70-79): 6.7% of the population
  • Extremely Low (<70): 2.2% of the population

What is the Flynn Effect?

The Flynn Effect is a term coined by James R. Flynn to describe the phenomenon of the steady increase in IQ scores across different populations over time. This increase is observed across both developed and developing countries and across various age groups.

The Flynn Effect challenges the notion that intelligence is an innate, fixed trait. Instead, it suggests that environmental and cultural factors play a significant role in shaping intellectual abilities. 

Flynn Effect

Some of the factors that have been proposed to contribute to the Flynn Effect include improved education, better nutrition, and increased exposure to technology.

Since IQ tests are standardized to have a mean score of 100 and a standard deviation of 15, the increase in IQ scores over time means that the tests need to be periodically re-normed to maintain their validity. 

Additionally, the Flynn Effect highlights the importance of considering cultural and environmental factors when interpreting IQ scores.

How are IQ Scores Calculated?

IQ scores are calculated by administering standardized tests designed to assess cognitive abilities in different areas, such as math, language, and spatial reasoning. These tests are typically administered by a licensed psychologist or other trained professional.

The most commonly used IQ test is the Wechsler Adult Intelligence Scale (WAIS), which is designed for individuals aged 16 and older. The test consists of several sub-tests to measure different aspects of intelligence. 

How are IQ Scores Calculated

Once an individual has completed the test, their performance is compared to that of a representative sample of the population to determine their IQ score. 

The average IQ score is 100, with scores ranging from 70 to 130 considered to be within the normal range.

Index Scales of Modern IQ Tests

Index scales are used in modern IQ tests to provide a comprehensive measurement of an individual’s cognitive ability. 

These scales measure various aspects of intelligence and provide a more accurate assessment of an individual’s intellectual abilities. Several index scales are commonly used in modern IQ tests, including:

1. Verbal Comprehension Index

The Verbal Comprehension Index measures an individual’s ability to understand and use language. This index includes tasks such as vocabulary, comprehension, and verbal reasoning.

2. Perceptual Reasoning Index

The Perceptual Reasoning Index measures an individual’s ability to process visual information and solve problems using nonverbal reasoning. This index includes tasks such as block design, matrix reasoning, and visual puzzles.

3. Working Memory Index

The Working Memory Index measures an individual’s ability to hold and manipulate information in their mind. This index includes tasks such as digit span and letter-number sequencing.

4. Processing Speed Index

The Processing Speed Index measures an individual’s ability to process information quickly and accurately. This index includes tasks such as symbol search and coding.

How to Improve Your IQ?

Improving your IQ is a popular topic, and fortunately, there are several ways to do so. Here are some tips to help increase your intelligence quotient:

How to Improve Your IQ
  1. Exercise your brain: Just like physical exercise, brain exercise is essential. Engage in activities such as puzzles, chess, or any other complex games that challenge your brain.
  2. Read: Reading is an excellent way to improve your IQ. It challenges your mind and helps expand your knowledge.
  3. Learn new things: Learning new things helps your brain to make new connections and improve cognitive functions.
  4. Get enough sleep: Rest is vital for your brain to function correctly. Lack of sleep can lead to memory problems, lack of concentration, and poor cognitive performance.
  5. Eat a healthy diet: Nutrition plays a role in brain development and function. Eat foods rich in omega-3 fatty acids, vitamins, and minerals to improve brain health.
  6. Challenge yourself: Push yourself out of your comfort zone, and take on new challenges. It helps improve your problem-solving skills and cognitive abilities.
  7. Practice mindfulness: Mindfulness practices can help reduce stress and improve cognitive performance.

By following these tips, you can improve your IQ and overall brain function. Remember, intelligence is not a fixed trait, and it can be improved with effort and dedication.

Related read:

Conclusion: Average IQ Score By Age

IQ scores provide a standardized measure of cognitive abilities, allowing for individual comparisons. However, it is important to consider IQ scores as one piece of the puzzle when assessing intelligence. Average IQ scores vary by age, reflecting the ongoing development and maturation of the brain. Factors such as genetics, environment, and socioeconomic status can influence IQ scores to some degree. 

Remember that intelligence encompasses various domains beyond IQ, and multiple factors influence success. By understanding IQ scores in context and appreciating the complexity of human intelligence, we can gain a more comprehensive perspective on intellectual capabilities.

FAQs: Average IQ Score By Age

Are IQ scores the same for males and females? 

On average, there is no significant difference in IQ scores between males and females. However, research suggests that there may be variations in specific cognitive abilities.

Can IQ scores predict future success? 

While IQ scores can provide some insights into cognitive abilities, they cannot predict an individual’s future success with certainty. A combination of factors, including motivation, personality traits, and opportunities, influences success.

Can IQ scores be influenced by cultural bias? 

IQ tests strive to be culturally fair and unbiased. Extensive efforts are made to ensure that the test items are culturally neutral and measure cognitive abilities rather than specific cultural knowledge.

Can IQ scores change with age? 

While individual IQ scores can fluctuate to some extent, especially during childhood and adolescence, they generally remain relatively stable throughout adulthood.

Are there alternative measures of intelligence besides IQ? 

Yes, there are alternative measures of intelligence, such as emotional intelligence, creativity assessments, and multiple intelligences theory proposed by Howard Gardner.

About The Author

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top