Final answer:
Cortisol levels may rise in older adults due to changes in the adrenal glands as the body ages.
Step-by-step explanation:
As the body ages, the adrenal glands undergo changes, resulting in a decrease in the production of cortisol. This is due to the increase in fibrous tissue. While the production and secretion of epinephrine and norepinephrine remain normal throughout the aging process, cortisol levels may rise in older adults.