Ageing

 Ageing or aging is a natural biological process involving the gradual changes in the structure, function, and resilience of an organism over time. This process is complex and influenced by both genetic and environmental factors.

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Mechanisms of Ageing

• Several theories attempt to explain the biological mechanisms of ageing:
• Genetic Theories: Some theories propose that ageing is programmed into our genes. The 'genetic clock' theory posits that ageing results from the activation and deactivation of certain genes.
• Damage Theories: These suggest that ageing results from accumulated damage over time. This includes oxidative stress, telomere shortening, and the accumulation of advanced glycation end products (AGEs).

Physical Changes

• As ageing progresses, physical changes occur across all body systems:
• Skin: Ageing skin typically becomes thinner, less elastic, and more prone to wrinkles and dryness.
• Musculoskeletal System: Age-related changes include loss of bone density (osteoporosis), decreased muscle mass (sarcopenia), and joint degeneration (osteoarthritis).
• Cardiovascular System: Ageing can lead to increased blood pressure, decreased heart rate variability, and a higher risk of cardiovascular diseases.
• Nervous System: Ageing is associated with cognitive decline, decreased reflexes, and an increased risk of neurodegenerative disorders like Alzheimer's disease.

Psychological and Social Changes

Ageing also encompasses psychological and social changes. Cognitive functions like memory and attention may decline, and changes in life circumstances, such as retirement or bereavement, can impact mental health. Social roles and relationships also evolve, with potential effects on quality of life and wellbeing.

Health Care and Ageing

Geriatrics, the branch of medicine focused on health care of older people, aims to promote health and to prevent and treat diseases and disabilities in older adults. A key part of geriatric care is understanding the unique challenges of ageing, including the management of multiple chronic conditions, and the promotion of healthy ageing.

References

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• Niccoli T, Partridge L. (2012). Ageing as a risk factor for disease. Current Biology, 22(17), R741–R752.
• Kennedy BK, Berger SL, Brunet A, et al. (2014). Geroscience: Linking aging to chronic disease. Cell, 159(4), 709–713.
• López-Otín C, Blasco MA, Partridge L, Serrano M, Kroemer G. (2013). The hallmarks of aging. Cell, 153(6), 1194–1217.

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