Is the IQ of humans getting older getting lower?

Jakarta, CNN Indonesia

Intelligence is usually measured by the level of IQ aka Intelligence Quotient. The higher the IQ, the more intelligent that person.

But can IQ decrease as you get older? Quotes Science AlertIQ does not change even though humans are getting older.

In other words, if a person takes an IQ test now, then takes it 10 years from now, that person’s IQ score will probably remain the same. That’s because IQ is always measured relative to other people of the same age.



“IQ is always calculated relative to a person’s age whether he is 10, 15, 25, 72, or 88. So someone who is 25 is compared to a person of the same age, so is 50,” said Alan Kaufman, an expert on testing. intelligence from Yale University.

Kaufman adds, for each age, the average IQ is set at 100. For this reason, there can be no comparison of IQ across ages. “Because by definition, each group will have an average of 100,” says Kaufman.

Kaufman’s opinion was agreed by Meiran Nachshon, a psychologist from Ben-Gurion University, Israel. He said, IQ indicates a person’s relative position with the average.

“IQ indicates the relative position of an individual to the average. That position is really stable,” said Meiran.

Furthermore, to measure changes in IQ over time, different methods are needed. This is because IQ cannot be compared across ages.

According to Kaufman on the Metafact site, the first thing to do is find common ground to compare the IQs of adults. “We can compare the performance of people 70 years, 60 years, 50 years, 40 years and so on against the standards used for young adults,” says Kaufman.

“In my research, we defined young adults at age 30 (usually ages 25-34). That way, young adults would have an average IQ of 100 because that’s the norm that has been developed,” he said.

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“When we compare adults across ages to young adults, it tells us how IQ changes as we age,” Kaufman added.

However, according to Kaufman, it is also necessary to pay attention to the level of education in each age group. Only then, the decline in the average IQ per age group can be seen.

According to Kaufman based on the WAIS-IV, the average IQ for ages 20-24 is 100, 99 for ages 25-44. “Then it goes down to 97 for ages 45-54, to 94 for ages 55-64, to 90 for 65-69, to 86 for 70-74 and to 79 for ages 74 and up,” Kaufman said.

Meanwhile, IQ tests measure many types of intelligence and classify them. But the two most popular are fluid intelligence and crystallized intelligence. “Both together with memory recall capabilities and processing speed, combine to deliver full-scale IQ,” says Kaufman.

Different types of intelligence have different development patterns with age.

Crystallized intelligence” averaged 98 at age 20-24, rose to 101 at age 35-44, before dropping to 100 (age 45-54), then 98 (55-64), then 96 (65-69), then 93 (70-74), and 88 (75+),” said Kaufman.

Fluid intelligence dropped much faster. Kaufman reveals that “it peaks at ages 20-24 (100), dropping gradually to 99 (25-34) and 96 (35-44) before plunging to 91 (45-54), 86 (55-64), 83 ( 65-69), 79 (70-74), and 72 (75+).”

[Gambas:Video CNN]


[Gambas:Video CNN]

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