Human IQ doesn't have a single "peak" age; different cognitive skills peak at different times, with fluid intelligence (speed/problem-solving) often peaking in the 20s-40s and crystallized intelligence (knowledge) peaking much later, while overall average scores rose for much of the 20th century (the Flynn Effect) but have recently stalled or reversed in some places.
Research Results. It has been shown that scores on IQ tests actually decrease with age. This chart shows how scores on Wechsler IQ tests peak between 25 and 29 years old, then decline throughout the rest of adulthood, with a decline becoming more steep after the age of 70.
It gradually became more popular and overtook the Stanford–Binet in the 1960s. It has been revised several times, as is common for IQ tests, to incorporate new research. One explanation is that psychologists and educators wanted more information than the single score from the Binet.
Snoop Dogg has publicly stated he has an IQ of 147, a score that falls into the "highly gifted" or "genius" category, much to his own surprise given his self-described average school performance (straight Cs). While this self-reported score suggests exceptional intellect, IQ tests measure specific cognitive abilities, and success in life and business (like Snoop Dogg's multifaceted career as a rapper, entrepreneur, and media personality) reflects a broader range of intelligence and skills.
You may not have noticed, but we are living in an intellectual golden age. Since the intelligence test was invented more than 100 years ago, our IQ scores have been steadily increasing.
No, an IQ of 97 is not considered dumb; it falls within the average range (90-109), indicating typical cognitive abilities, and is very close to the theoretical average of 100, meaning you're more intelligent than about 42% of people and have normal intelligence, just slightly below the mean, but well within the typical range for most adults.
Brain Development, IX: Human Brain Growth
Although total brain volume is about 95% of its adult size by the age of 5 years, various subcomponents of the brain do undergo age-related changes. In general, white matter—an indication of myelination—increases with age, while gray matter decreases with age.
We all know that Gaga is a creative genius, but it turns out she's an actual genius too with a widely-estimated IQ of 166, making her “exceptionally gifted” — and we don't disagree!
Kanye West (Ye) publicly claimed to have a 142 IQ in an April 2025 social media post, a score he stated meant he had a "genius intellect," though this remains an unverified, self-proclaimed figure not supported by official test results. While supporters praised the claim, many questioned its accuracy, and there's no official, independently verified IQ score for him, with intelligence being a multifaceted concept beyond a single number.
Madonna reportedly has a genius-level IQ of around 140, well above the average, with sources citing her intelligence and business acumen, often linking it to her ability to recognize patterns and disrupt culture. This high score is sometimes associated with her academic achievements, like receiving a scholarship to the University of Michigan, and her remarkable career longevity, making her a highly successful artist.
An IQ of 72 is considered borderline intellectual functioning, falling below the average range (90-109) but not quite low enough for a diagnosis of intellectual disability (typically below 70). It signifies slower learning, potential difficulties with complex concepts, and a need for more support in daily living and academic skills, placing someone in the bottom few percentiles of the population.
Intelligence is highly heritable and predicts important educational, occupational and health outcomes better than any other trait. Recent genome-wide association studies have successfully identified inherited genome sequence differences that account for 20% of the 50% heritability of intelligence.
But since IQ scores are age-normalized, your IQ score will remain relatively constant. Abilities change, but IQ scores tend to be very stable. However the intelligence ability is changing during the life, the IQ (intelligence quotient) does not.
Some mental skills are sharpest at different ages, with many not peaking until age 40 or later. Short-term memory is strongest at age 25, stays steady until 35, and then starts to decline. Emotional understanding peaks during middle age, while vocabulary and crystallized intelligence peak in the 60s and 70s.
Varying IQ Scores Across Age Groups
As people age, especially into their later years, there is a noticeable decline in IQ scores. Notably, individuals aged 70 to 74 may score around 119, but by the time they reach 75 and older, the average IQ can drop to as low as 79.
🧠 New research shows the smartest age in life is 55 to 60 – not in your 20s. While youth is often seen as the peak of brainpower, science now suggests the smartest age in life may actually be between 55 and 60.
Ben Affleck's IQ is often cited as 154, placing him in the highly gifted range, though these figures for celebrities are estimates, with some sources also mentioning high intellect in relation to his work, such as co-writing Good Will Hunting with Matt Damon.
Rappers IQ's, Jay Z has an IQ of 148, Kendrick Lamar has an IQ of 129, Tupac Shakur IQ is 124, Lil Wayne IQ is 120, and last is Eminem with 110 IQ. Archived post.
Celebrity Genius 5 - James Woods
Emmy Award winner James Woods is an Oscar-nominee and superstar has a whopping IQ of 180. While in high school, Woods was in a UCLA linear algebra course.
J. Robert Oppenheimer's IQ is unknown because he never took an official test, but estimates place him in the 130s-140s, suggesting very high intelligence, though some debate if IQ fully captures his genius, considering his vast knowledge in languages, literature, and physics, Britannica. While one source suggests 135 (99th percentile), others emphasize his polymath skills and leadership, noting IQ tests don't cover creativity, which was crucial to his success, IMDb.
She was a very smart girl (with an IQ of 154), became a bookworm, and once was told that a suitable job for her (and her brains) was to become a lawyer. However, her first love was still the black-and-white movies, especially those featuring.
Marilyn Monroe had an IQ of 168! Despite being typecast as the quintessential “dumb blonde,” she was highly intelligent and had a deep love for literature. She owned over 400 books, including works by Dostoevsky, Freud, and Hemingway, and even took literature courses at UCLA.
“The first three years are extremely, completely important for kids because that's when those neurons connect and then they're there for life,” George said. “That's a permanent infrastructure and at age 4, the brain changes. Any neurons that haven't been connected get purged out of the brain.”
A new study has found that adolescence can continue until the age of 32, as humans hit four major “turning points” in brain development at the ages of about nine, 32, 66 and 83.
There are only a few things that researchers can agree on. First, after the age of 60, nearly everyone will start to experience some decline in cognitive skills, most noticeably in memory, and this decline will be accompanied by a change in brain structure. Second, aerobic exercise slows or delays this mental slippage.