Final answer:
The aging brain experiences considerable shrinkage, particularly in the prefrontal cortex, hippocampus, and cerebellum, which affects planning, memory, and motor functions.
Step-by-step explanation:
Overall, there is a considerable shrinkage that occurs in the aging brain. The prefrontal cortex, the hippocampus, and the cerebellum all exhibit significant shrinkage with age. The prefrontal cortex is particularly important as it is involved in planning, judgment, reasoning, and working memory. Changes in this area can affect personality, mood, and behavior. The hippocampus, vital for memory and learning, and the cerebellum, important for motor control and coordination, also tend to shrink. This selective atrophy may impact cognitive and motor functions in the elderly.