K.Warner Schaie's sequential studies research suggests that fluid intelligence (the ability to deal with new problems and situations) declines with age, while crystallized intelligence (the store of information, skills, and strategies that people have acquired) remains steady and in some cases actually improves.

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Schaie's research indicates that fluid intelligence generally declines with age, while crystallized intelligence remains relatively stable, and can even improve in certain cases due to accumulation of knowledge and experience.

KWarner Schaie's Sequential Studies Research Suggests That Fluid Intelligence (The