The Wear-and-Tear Theory proposes that aging is caused by the gradual deterioration of cells and tissues due to everyday wear and tear.

Age-Related Cognitive Decline refers to the gradual decline in cognitive abilities, such as memory, attention, and problem-solving, that is commonly associated with aging.

Thyroid Hormone is responsible for regulating metabolism and its levels often decline with age, contributing to changes in metabolism and energy levels.

Senescence refers to the process by which cells lose their ability to divide and reproduce, leading to the accumulation of non-functional cells in the body.

The Telomere Shortening Theory proposes that aging is caused by the progressive shortening of telomeres, which eventually leads to cellular dysfunction and death.

Sarcopenia refers to the age-related loss of muscle mass and strength, which can lead to reduced mobility and functional limitations.

The Mutation Accumulation Theory proposes that aging is caused by the accumulation of genetic mutations that impair cellular function and contribute to age-related decline.

Osteoporosis refers to the age-related loss of bone density, making bones more fragile and susceptible to fractures.

The Homeostatic Imbalance Theory proposes that aging is caused by the body's declining ability to maintain a stable internal environment, leading to disruptions in physiological processes.

Kyphosis refers to the abnormal curvature of the spine in the upper back, resulting in a hunched posture.

The Repair and Regeneration Decline Theory proposes that aging is caused by the body's reduced capacity to repair and regenerate tissues, leading to the accumulation of cellular damage.

Contracture refers to the gradual loss of flexibility in the joints, making it difficult to move and perform daily activities.

The Energy Decline Theory proposes that aging is caused by the body's reduced capacity to produce and utilize energy, leading to fatigue and decreased physical performance.

Presbyopia refers to the age-related loss of near vision, making it difficult to focus on objects up close.

The Homeostatic Dysregulation Theory proposes that aging is caused by the body's reduced capacity to maintain a stable internal environment, leading to disruptions in physiological processes.