Final answer:
VO2 max reaches its peak during early adulthood, around 20 to the mid-30s, and begins to decline during middle adulthood, from the mid-30s to the mid-60s. The correct answer is C) Early adulthood / Middle age.
Step-by-step explanation:
The peak of VO2 max, which is a marker for cardiovascular fitness and overall physical performance, typically occurs during early adulthood. This period aligns with the ages from about 20 to the mid-30s. During early adulthood, individuals often complete their education, start careers, form intimate relationships, and reach the peak of their physical abilities, including strength and physical performance.
As individuals enter middle adulthood, which lasts from the mid-30s to the mid-60s, they begin to exhibit signs of physical aging, such as the development of wrinkles and gray hair. During middle adulthood, there is a gradual decline in various physical capabilities, including VO2 max, strength, aerobic performance, and reaction time. This decline becomes more noticeable and health conditions, such as type 2 diabetes, cardiovascular diseases, and various forms of cancer, are more commonly diagnosed.
Therefore, VO2 max reaches its peak during early adulthood and begins to decline during middle adulthood. The correct answer to the question is C) Early adulthood / Middle age.