Describe the changes in the older adult's brain outlined in the text.

As people age, there are several changes that occur in the older adult's brain. These changes include a decrease in brain volume and weight, particularly in the frontal lobes and hippocampus. There is also a reduction in the number of neurons and synapses, as well as a decrease in the production of neurotransmitters. Additionally, there may be an increase in the presence of beta-amyloid plaques and neurofibrillary tangles, which are associated with Alzheimer's disease. These changes can lead to cognitive decline, including difficulties with memory, attention, and problem-solving. However, it's important to note that not all older adults will experience these changes to the same extent, and factors such as genetics, lifestyle, and overall health can play a role in the aging brain.