Evolution and Progression of Global Aging Initiatives

The University of Arizona Global Campus

HUD 5420 Interdisc Theories of Ger Instructor: Gregory Hickman

June 13, 2022

Blueprint for Healthy Aging, Theoretical Models and Concepts

There has been a long-standing interest in the nature and contributing aspects of effective aging by lifespan developmentalism. Insights into the complexities of human growth and aging have been uncovered using variable-oriented techniques. Instead, we used a more subgroup-oriented strategy and assessed various indicators of late-life change at the individual level in the research.

Developmental psychologists are interested in uncovering the main factors that enable individuals to enjoy happy and successful lives (Achenbaum, 2018). For example, the Rowe and Kahn (1997) aging model suggests that healthy and active aging is associated with a mix of common sickness and disability rates, good cognitive and physical abilities, and high levels of social interaction. Based on set criteria, empirical research employs cross-sectional data to discover subgroups of individuals who age more or less well (Barja, 2019). Aging, on the other hand, is an ever-changing phenomenon. The dynamic aspect of the phenomena may be better articulated in conceptual and practical definitions, revealing more subtle patterns and forms of effective aging. Biological hypotheses of human aging now fall into two categories: those that focus on genetics and those that focus on damage or mistake.

In contrast, those that claim changes in gene expression biologically govern aging are called programmed theories. Biological mechanisms or programs that deliberately cause or allow deterioration and death to obtain an evolutionary advantage are known as "programmed aging theories," while "non-programmed" theories, which are based on evolutionary concepts, are known as "non-programmed aging theories," and "programmed aging theories," which are known as "programmed aging theories." (Grande, 2018)

There are two primary biological hypotheses on human aging in modern times: theories about programmable aging and theories about aging caused by damage or mistake. Biological theories of aging suggest that the process of aging is a continuation of the process that governs growth and development in childhood. Defensive reactions may play a role in gene expression variations that affect the systems responsible for maintaining and repairing tissues. Error- or damage-based theories claim that the accumulation of harm over time is a primary factor in aging.

Programming theory is divided into three main categories: Life Extension by Computer Programming. Age-related deficits are manifested as a series of gene activations and deactivations known as senescence. In the Endocrine Theory, there is a lot of discussion regarding how genetic instability impacts aging and the aging process. Humans' biological clocks are affected by hormones, which slow the aging process. An increasing body of evidence suggests that hormones play an important role in aging's hormonal control and that the evolutionarily conserved IIS signaling pathway is critical. (IIS) Immunology theory. A decreasing immune system causes aging and death, which is why the immune system diminishes with time. It is well accepted that the immune system's efficiency peaks in adolescence and then declines with age.

Immunodeficiency at one age may lead to cellular stress and eventually mortality, as antibodies lose their ability to fight off new illnesses (West et al., 2019). Dysregulation of the immune response has been associated with various diseases, including cardiovascular disease, inflammation, Alzheimer's disease, and cancer. The immune system has been linked to some of these adverse effects, even though direct causal linkages have not been demonstrated (Trevisan et al., 2019).

One theory of damage or error is that of wear and tear. The breakdown of vital components in cells and tissues is the root cause of aging. In the same way that worn-out parts of an old car eventually kill the vehicle as a whole, so do worn-out parts of the body. In 1882, a German scientist named August Weismann first put forth the wear-and-tear theory of aging. Many people today find it to be a helpful analogy because it accurately reflects what happens to most daily objects (Achenbaum, 2018). Theory concerning the rate at which people age. As an organism's lifespan shortens, its oxygen basal metabolism increases (Brys, Vanfleteren, & Braeckman, 2007). It is helpful, but when it comes to determining human longevity, the aging rate-of-living hypothesis fails (West et al., 2019). However, this idea has been tweaked in a way consistent with Pearl's theory to emphasize the hard-wired antagonism between growth and stress resistance (Jin, 2010).

Cross-linking theory Bjorksten's cross-linking hypothesis of aging was first proposed by Johan Bjorksten in 1942. (Zemanek, 2015). According to this idea, the accumulation of cross-linked proteins affects cells and tissues, slowing down biological functioning. Cross-linking mechanisms have recently been shown to play a role in the age-related changes in the proteins under investigation. As a final theory to consider, free radicals have been proposed. In 1954, Dr. Gerschman postulated that macromolecular damage to cells and organs might be caused by superoxide anion and other free radicals, further developed by Dr. Denham Harman (Golubev, Hanson, & Gladyshev, 2018). There are several macromolecules that free radicals can target.

Additionally, nucleic acids can have different bases or sugar groups added to them, and the backbone can be split into a single or double-stranded structure. Cell death rates and life expectancy are reduced because enzymes prevent free radicals from accumulating in the body. Antioxidant-treated mice lived longer on average, according to research done on them.

References

Achenbaum, W. A. (2018). Ever-Emerging Theories of Aging. In Oxford Research Encyclopedia of Psychology.

Barja, G. (2019). Towards a unified mechanistic theory of aging. Experimental gerontology, 124, 110627.

Brys, K., Vanfleteren, J. R., & Braeckman, B. P. (2007). Testing the rate-of-living/oxidative damage theory of aging in the nematode model Caenorhabditis elegans. Experimental gerontology, 42(9), 845-851.

Golubev, A., Hanson, A. D., & Gladyshev, V. N. (2018). A tale of two concepts: harmonizing the free radical and antagonistic pleiotropy theories of aging. Antioxidants & redox signaling, 29(10), 1003-1017.

Grande, S. (2018). Aging, precarity, and the struggle for Indigenous elsewheres. International Journal of Qualitative Studies in Education, 31(3), 168-176.

Jin, K. (2010). Modern biological theories of aging. Aging and disease, 1(2), 72.

Trevisan, K., Cristina-Pereira, R., Silva-Amaral, D., & Aversi-Ferreira, T. A. (2019). Theories of Aging and the Prevalence of Alzheimer's Disease. BioMed research international, 2019.

West, M. D., Sternberg, H., Labat, I., Janus, J., Chapman, K. B., Malik, N. N., ... & Larocca, D. (2019). Toward a unified theory of aging and regeneration. Regenerative medicine, 14(9), 867-886.

Zemanek, V. (2015). Aging theories: Is there a unifying factor in aging?. memory, 1, 04-2015.