The statement about iq is remains stable over a lifetime is true.
What is IQ?
An intelligence quotient (IQ) is a total score calculated from a battery of standardised tests or subtests designed to assess human intelligence. The abbreviation "IQ" was established by psychologist William Stern for the German term Intelligenzquotient, his designation for a scoring procedure for intelligence tests at the University of Breslau that he promoted in a 1912 book.
From birth until adolescence, intelligence showed a great degree of consistency. Intelligence progresses in a stage-autoregressive manner. Infant IQ scores have a limited prediction potential due to their low dependability.
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