An older person states that "it's just a matter of time" before a knee and hip replacement will be needed. Which theory of aging is this describing?

An older person states that "it's just a matter of time" before a knee and hip replacement will be needed. Which theory of aging is this describing?

• A. Endocrine
• B. Programmed longevity
• C. Wear and tear
• D. Immunological

Answer: (C)

Wear-and-tear aging describes how accumulated mechanical use over time leads to degeneration in tissues, especially weight-bearing joints like the knee and hip. When someone says it’s just a matter of time before needing a replacement, this fits because osteoarthritis and other degenerative changes arise from years of joint loading and wear, eventually producing enough damage that joint replacement becomes necessary. The endocrine theory would link aging to hormonal changes and metabolic shifts, not a predictable wear pattern. The programmed longevity idea suggests a genetic timetable driving aging, rather than damage from use. The immunological theory focuses on immune system decline contributing to disease, not specifically the progressive mechanical degeneration of joints.

Wear-and-tear aging describes how accumulated mechanical use over time leads to degeneration in tissues, especially weight-bearing joints like the knee and hip. When someone says it’s just a matter of time before needing a replacement, this fits because osteoarthritis and other degenerative changes arise from years of joint loading and wear, eventually producing enough damage that joint replacement becomes necessary.

The endocrine theory would link aging to hormonal changes and metabolic shifts, not a predictable wear pattern. The programmed longevity idea suggests a genetic timetable driving aging, rather than damage from use. The immunological theory focuses on immune system decline contributing to disease, not specifically the progressive mechanical degeneration of joints.