Knowing that, IQ in old age can be protected by practicing mental acuity and making sure to keep one’s mind active through reading, puzzles, games, and social activities. That said, crystallized intelligence remains intact, only fluid intelligence seems to decline with old age. Many studies looking into the correlation between age and intelligence note that, for most people, IQ remains rather stable throughout early and mid-adulthood, and often remains so until late-adulthood, when it is shown to decline slowly. Therefore, if someone is capable of doing the work of a person who is thirteen (13), but they themselves are in reality only (10), their IQ would be 130, because (13/10) x 100 = 130. IQ scores are calculated by taking someone’s mental age (the age at which they operate) and dividing it by their chronological age (the age that they actually are), and multiplying the answer by 100. Though the spectrum of IQ scores is wide at first glance, the majority of people score between 85 and 115.
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