Final answer:
As a person ages, their levels of cardiorespiratory fitness tend to decline. However, there are exceptions and some people remain fit and active in old age.
Step-by-step explanation:
As a person ages, his or her levels of cardiorespiratory fitness tend to decline. Declines generally occur in stamina, strength, reflex times, and the senses. However, it's important to note that there are exceptions and some people remain fit and active in old age.