Final answer:
As we age, our fluid intelligence decreases while our crystallized intelligence tends to hold steady or improve. Mental and physical activity can delay cognitive decline and help maintain cognitive abilities.
Step-by-step explanation:
As we age, our level of fluid intelligence decreases, while our level of crystallized intelligence tends to hold steady or even improve. Fluid intelligence refers to our ability to process information, reason, and solve problems, while crystallized intelligence is the knowledge and skills we have acquired through experience. While fluid intelligence declines in late adulthood, mental and physical activity can delay cognitive decline and help maintain cognitive abilities.