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What are average IQ scores by age?

Average IQ scores can vary slightly depending on the source and the specific test used, but here are some general trends and average IQ scores by age group based on the available research:

General Average

The average IQ score for any age group is typically set at 100, which is the center of the normal range. This score is standardized to ensure that the mean IQ for each age group is 1001 3 4.

Age-Specific Averages

Here are some average IQ scores for different age groups, though these should be interpreted with caution as they can vary:

16-17 years old: 1081 3 4
18-19 years old: 1051 3 4
20-24 years old: 991 3 4
25-34 years old: 971 3 4
35-44 years old: 1011 3 4
45-54 years old: 1061 3 4
55-64 years old: 1093 4
65-69 years old: 1143 4
70-74 years old: 1192 3 4

Changes in Cognitive Abilities with Age

It's important to note that different aspects of intelligence change differently with age:

Fluid Intelligence: This type of intelligence, which involves solving novel problems, tends to peak in early adulthood and then declines more significantly with age5.
Crystallized Intelligence: This type, which involves knowledge and skills learned through experience, tends to remain stable or even increase until middle age before declining5.

Overall Trends

While the average IQ scores may appear to increase or decrease at different ages, it is crucial to understand that these scores are age-adjusted. In reality, certain cognitive abilities may decline with age, but the overall IQ score is standardized to reflect the average performance for each age group5.