If people of different generations took the same IQ test, standardized long ago and not restandardized, today's young adults would score, on the average:

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This is known as the Flynn effect, which refers to the observed phenomenon that IQ scores have been increasing over time in many countries. This trend is believed to be due to environmental factors such as improved nutrition, education, and technology. Therefore, today's young adults would likely score higher on an IQ test than their parents or grandparents did when they took the same test years ago.

If People of Different Generations Took the Same IQ Test