There isn't one single "best" age for memory; different types of memory peak at different times, but the late teens and early twenties (around 18-25) are crucial for forming vivid autobiographical memories and peak in some cognitive functions, while younger children excel at certain specific memory tasks, and older adults retain vast accumulated knowledge (crystallized intelligence).
Our ability to remember new information peaks in our 20s, and then starts to decline noticeably from our 50s or 60s. Because the hippocampus is one brain region that continues producing new neurons into adulthood, it plays an important role in memory and learning.
Like physical strength, several core cognitive abilities, including reasoning, memory span, and processing speed, tend to peak relatively early in adulthood, typically between 18 and 22 years of age (Salthouse, 2019).
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.
The University of Edinburgh study reported that the oldest child tends to have a higher IQ and thinking skills than their younger siblings. This is due to higher mental stimulation the first-born receives, CBS affiliate KUTV reports.
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.
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.
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.
The higher your intelligence, the lower your risk of becoming ill and dying prematurely. This correlation applies across the entire intelligence scale,” says Anton Lager, researcher in public health at the Department of Global Public Health at the Karolinska Institute.
Starting in your 60s, you may notice normal cognitive aging when your brain's processing speed slows down. You may not readily recall the name of a childhood friend or forget where you parked the car. You might take longer to calculate a restaurant tip in your head.
Toddlers have a knack for sensing the emotional tone in their surroundings. So, while they might not specifically remember a shouting incident, the negativity can linger.
More than 24,000 chess games played in professional tournaments over 125 years have been analyzed by scientists to measure how age affects cognitive ability. They conclude that humans reach their cognitive peak around the age of 35 and begin to decline after the age of 45.
The "2-finger test" for dementia involves an examiner showing a hand gesture (like interlocking index and middle fingers) and asking the patient to copy it, testing motor skills, visual memory, and coordination, as difficulties can signal early cognitive decline, but it's a screening tool, not a definitive diagnosis, prompting further medical evaluation. Other related tests include finger-tapping and finger-to-nose, looking for hesitation or misjudgment in movement.
It's completely normal to not remember much of your childhood, and this doesn't necessarily mean anything is wrong. Often, our limited recollections are based on normal memory development. But for some people, suppressed or fragmented memories may be the result of childhood trauma.
“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.”
The last part of the brain to mature is the part that makes us human: the prefrontal cortex. It controls complex thinking, decision-making, impulse control, and personality. The neurons in the prefrontal cortex are present at birth, but they aren't fully myelinated and connected until around the age of 25.
Screen time induces stress reactions.
Additionally, both hyperarousal and addiction pathways suppress the brain's frontal lobe, the area where mood regulation actually takes place.
Lady Gaga's IQ is widely rumored to be around 166, placing her in the "exceptionally gifted" or genius category, though this is an estimation often cited in celebrity lists, not a officially verified number from a public test. This high estimate is supported by her early academic achievements, like attending a summer program for the top 1% of students, and her demonstrated creative and musical genius as a composer and performer, notes Us Weekly and Brainmanager.io.
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.
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. In addition, his SAT scores were amazing. Even though he had a full scholarship to MIT, Woods dropped out to pursue acting.
🧠 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.
Peaking later in life
Several of the traits we measured reach their peak much later in life. For example, conscientiousness peaked around age 65. Emotional stability peaked around age 75. Less commonly discussed dimensions, such as moral reasoning, also appear to peak in older adulthood.
The period from 0 to 5 years of age is often referred to as the "Golden Period" of child development. During this crucial phase, a child's brain grows rapidly—even reaching 90% of its adult size.