Declines in intelligence with age tend to occur in which domain?

• A. Crystallized intelligence
• B. Fluid intelligence
• C. Spatial navigation
• D. Emotional intelligence

Answer: (B)

Declines in intelligence with age tend to occur in fluid intelligence. Fluid intelligence involves processing speed, working memory, and the ability to solve novel problems without relying on prior knowledge. These flexible, rapid mental operations tend to slow down and become less efficient with age, leading to noticeable declines on tasks that require new problem solving or quick reasoning.

In contrast, crystallized intelligence—the store of vocabulary, general knowledge, and skills built up over a lifetime—usually remains stable and can even improve with age because it draws on long-term memory and experience. Some spatial navigation skills can show age-related changes, and emotional intelligence is often relatively well preserved, but the domain most consistently showing age-related decline is fluid intelligence.