Usually we refer to intelligence as "crystal" or "flow". Fluid intelligence is roughly converted to "new learning". That is, it includes caution, working memory, memory, understanding, language, and many other cognitive factors. From the late 1960s to the early 1970s there is a tendency to see an age-related depression (not dementia) where men were older than women. However, this does not mean that older patients can not learn newly, it is inefficient. Since the intelligence of crystallization is roughly transformed into wisdom and is related to activities such as quick judgment and decision making, experience provides a way to acquire experience and heuristics, speeding up the cognitive process. Clearly, the longer a person lives, the more they gain experience in making a quick decision. However, this is not a difficult rule as cognition also decreases with age.
Well, it is a question about "intelligence". Intelligence tests or IQ tests are calculated by comparing scores with "standard data". If someone performs an IQ test in order to compare the score with others' age, 85-year-olds may behave differently even if they are 'average' with 35-year olds. For example, in the IQ test, the lower the score of a specific timed exercise test for the elderly, the higher the standard score, as the age considers the speed rather than the cognitive ability. According to general information, it is assumed that older people have daily knowledge, so even if the raw score is low, young people have higher standard scores.
However, intelligence as a scientific concept has endured. The scores the people got from intelligence examinations are similar from childhood to old age. The scores of intelligence tests are related to many other things, from the response time of people answering simple questions to the possibility of their survival in the 1970s. It is not clear whether the measured value of intelligence test, that is, the efficiency of brain wiring is. In recent years scientists began looking for genes that play an important role in how we conduct these tests.
We all have the same basic brain hardware, and although there are differences in intelligence among people, the difference is relatively small and has little correlation with the outcome of life. But what is different is how much we trust ourselves and abilities. An important factor in finally deciding where we go to in life is whether there is what Stanford University researcher Carol Dweck calls "fixed" or "growth thinking". I am going to cancel the fixed mindset I have cultivated over the years. I will use my iPhone note tool to brainstorm the maximum and crazy idea that I can think through my daily exercises. These ideas range from starting a billion dollar business to designing a way to live on the moon. Thinking bigger everyday makes my thinking beyond the limits and helps me become a more creative thinker.