Final answer:
As we age, the nervous system undergoes changes such as deeper sleep, increased reasoning, increased neuron death, and slower reaction times.
Step-by-step explanation:
As we age, the nervous system undergoes several changes. Sleep becomes deeper, reasoning may increase, neurons die at an increased rate, and reaction times may increase. These changes are due to various factors, including the decline in brain function, reduced efficiency of the immune system, and loss of brain cells.