What happens as a person ages in terms of the biological process?

As a person ages, they experience a continuous biological process known as aging, which is characterized by gradual changes over time. This includes various physiological, cellular, and genetic transformations that can affect body function and overall health. The aging process often involves a decline in the body's ability to repair and maintain itself, leading to changes such as reduced muscle mass, slower metabolism, and increased vulnerability to diseases.

This biological progression is universal and affects all living organisms, indicating the inevitable passage of time and its effects on biological systems. While growth and development occur earlier in life, aging signifies moving forward in time and facing the complexities and challenges that come with it. The notion that individuals "grow older" encompasses both the physical deterioration and the accumulation of experiences that accompany aging, thus making it the correct choice.