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These studies suggest that IQ varies with age, with Performance IQ and Full Scale IQ generally declining from age 20 to 74, Verbal IQ remaining stable, heritability of IQ reaching a high level by early adulthood, and certain factors such as autism spectrum disorder and gender potentially influencing IQ scores differently across age ranges.
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The relationship between age and intelligence quotient (IQ) has been a subject of extensive research. Various studies have explored how IQ scores fluctuate across different age groups, considering factors such as educational attainment, heritability, cognitive development stages, and the impact of sex differences.
Educational Attainment and Age-Related IQ Changes
Heritability of IQ Across Age
Cognitive Development Stages and IQ
IQ Stability and Developmental Disorders
Sex Differences in IQ Over Time
Age, IQ, and Cognitive Timing Tasks
Generational Changes in IQ and Age
Childhood IQ and Longevity
Childhood IQ and Mental Health
Stability of IQ Scores in Autistic Children
In summary, IQ scores demonstrate a complex relationship with age, influenced by factors such as education, heritability, and cognitive development stages. While verbal IQ may not decline significantly with age when education is controlled, performance and full-scale IQ show declines. Heritability of IQ becomes more pronounced in adulthood, and cognitive development follows predictable stages in adolescence. In ASD, IQ scores are stable from childhood to adulthood, but may decline in lower ranges. Sex differences in IQ emerge in adolescence, with boys overtaking girls. Cognitive timing abilities in older adults vary with IQ levels, and generational shifts in the age-IQ relationship have been observed. Higher childhood IQ is associated with increased longevity and lower risk of mental health issues later in life. Lastly, IQ scores in young autistic children are stable over time, particularly when assessments are consistent.
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