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View Diary: Morning Feature: Streaming into Success (102 comments)

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  •  Does IQ change from your 20's to 60's? (6+ / 0-)

    Is IQ relatively stable over a lifetime? Or do other factors, like 'the wisdom of age' start to seem more important?

    I'm just curious and if someone would know this, it'd likely be someone here.

    Morning and thanks for the diary.

    •  The traditional IQ tends to decline with age. (4+ / 0-)

      The "quotient" part of "Intelligence Quotient" was originally expressed as (IA/CA * 100) where IA denotes Intellectual Age and CA denotes Chronological Age.  So if at age 12 you knew as much as a typical 14-year-old, your IQ would be 14/12 * 100 = 116.

      Because childhood IQ tests measure the kinds of knowledge that tend to "max out" in our early 20s, those IQ scores tend to decline with age.  Those with higher IQs learned that knowledge sooner, but most of the rest have caught up (for most of that knowledge) by the late-20s.  And most of what the rest didn't learn (e.g.: calculus, or the last four Roman emperors) has been forgotten by those who did.

      IQ tests that for adults are a bit different, and don't measure "Intelligence Quotient" as originally defined.  Instead they measure how much obscure stuff you know and the kinds of word, logic, and spatial problems you can or can't solve.  That can change throughout your life as you learn (or forget) things.

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