Final answer:
Physiological changes occur with aging, including a decrease in brain cells and less efficient immune system. Aging also leads to declines in stamina, strength, reflex times, and the senses, making older individuals more sensitive to medications.
Step-by-step explanation:
As individuals age, there are physiological changes that occur in the body. One major change is the decrease in the number of brain cells, which can lead to cognitive impairment in some cases. The immune system also becomes less efficient, increasing the risk of serious illnesses like cancer and pneumonia. Additionally, aging is often accompanied by a decline in stamina, strength, reflex times, and the senses, which can make older individuals more sensitive to medications, including psych meds.