Which statement best describes crystallized intelligence in adulthood?

• A. Fluid intelligence refers to the ability to solve novel problems and tends to decline with age.
• B. Crystallized intelligence is accumulated knowledge; tends to stay stable or improve with age.
• C. Fluid intelligence declines only in early childhood.
• D. Crystallized intelligence declines rapidly after middle age.

Answer: (B)

Crystallized intelligence is the accumulated knowledge and skills a person has gained through education and life experience. In adulthood, this type of intelligence tends to stay stable or improve because your knowledge base—vocabulary, general information, and familiar concepts—continues to grow with time and practice. This is why tasks like vocabulary tests or answering questions about common facts often remain strong or get better as you age. In contrast, solving new, unfamiliar problems relies more on fluid intelligence, which tends to decline somewhat with age due to changes in processing speed and working memory. So the best description is that crystallized intelligence is accumulated knowledge that tends to stay stable or improve with age.