According to the work of Cattell and Horn (1963, 1988), there are two types of intelligence:

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Cattell and Horn proposed the theory of Fluid and Crystallized Intelligence. Fluid intelligence is the ability to reason abstractly, think logically, and solve problems in novel situations. It declines with age, as it involves neurological factors that deteriorate with age. On the other hand, crystallized intelligence is the knowledge and skills acquired through experience and education. It is the ability to use learned knowledge, skills, and experience.

According to the Work of Cattell and Horn (1963, 1988)