Which fitness component may be particularly affected by aging?

As individuals age, multiple aspects of physical fitness can be affected, which is why selecting all of the above is accurate. Speed tends to decline due to decreased muscle strength and reaction times, both of which are influenced by aging. Muscle size is also impacted, as there is often a loss of muscle mass or a condition known as sarcopenia, which can lead to reduced strength and power. Cardiovascular endurance generally decreases as well, primarily because of changes in heart function and reduced efficiency of the cardiovascular system.

The interplay of these factors makes it evident that all components listed in the question can be significantly affected by aging. This holistic view highlights the importance of addressing various fitness components in exercise programs, especially for older adults, to promote overall health and functional ability.