The correct option is fluid. Fluid intelligence begins to decline in the twenties.
One of the various theories of intelligence in psychology is fluid vs. crystallised intelligence. While crystallised intelligence refers to a person's lifetime accumulation of knowledge, facts, and abilities, fluid intelligence is the capacity for flexible reasoning and thought. People frequently assert that as they become older, their IQ seems to deteriorate. However, studies indicate that whereas fluid intelligence starts to decline after puberty, crystallised intellect keeps growing until adulthood. Raymond Cattell, a psychologist, initially presented the hypothesis of fluid vs. crystallised intelligence; he furthered it with his pupil John Horn. According to the hypothesis, intelligence is made up of various skills that interact and complement one another to form overall individual intelligence.
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