Age can significantly affect an individual's fitness level due to changes in muscle mass, bone density, and metabolic rate. As people age, they tend to lose muscle, a process known as sarcopenia, which can lead to decreased strength and balance. Similarly, bone density often declines, increasing the risk of fractures. These physiological changes can impact performance in physical activities. However, regular exercise, especially strength training and aerobic activities, can mitigate age-related decline, promoting greater functional capacity and overall health in older adults.