Which parts of the brain shrink the most in later life? hippocampus and prefrontal cortex hippocampus and corpus callosum prefrontal cortex and thalamus prefrontal cortex and hypothalamus?

Thalamus and Prefontal cortex (PFC)

Thalamus is known to be a small region that is found at the center of the brain and function by relaying signals to the eyes, mouth of the brain and function by relaying signals from the eyes, skin, mouth and ears to the other part of the brain for processing. However, prefontal cortex is the region of the brain that is involved in planning complex cognitive behavior, decision making and personality expression. Also, prefontal cortex are considered to be involved in thought orchestration and support concrete rule learning.