The Main Theories of How the Process of Aging Works
This report outlines the main theories of how the process of aging works. Since researchers have not discovered a universally-accepted theory of aging, the theories discussed are potential explanations of how we age. The likelihood of each hypothesis is considered roughly equal. The different theories discussed focus on the workings of different parts of the body, from the molecular level of DNA mutations and replication, to the organism level of becoming “worn out.” Aging is a very complex and gradual process, and its ongoing operation is present to some degree in all individuals. It is a journey to the maturity, as well as to the degeneration of the body. Because aging affects every part of the body, many different steps are involved and various types of reactions occur. Changes in DNA take place, which can and often do affect the way the body functions; harmful genes are sometimes activated, and necessary ones deactivated. A decrease in important body proteins like hormones and certain types of body cells is almost inevitable. These, among many, are characteristic changes that take place in our bodies as time moves on and aging continues. At present, a universal explanation for how we age or why we age does not exist, but there are many theories to explain this puzzle, and they are supported by continuous research. In this report, some of the how theories of aging will be examined. Among them are theories concerning spontaneous mutations, damage from free radicals, the clock gene, cellular aging, a weakened immune system, wear and tear, and hormonal and neuroendocrinous changes. Spontaneous Mutations The spontaneous mutations theory, also known as the s...
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...e changes arise because of different signals in the brain (Ricklefs and Finch, 1995, 44). The hormonal and neuroendocrine theory collects evidence mostly from a female way of life, yet both men and women experience the aging process and many of the same characteristics that go with it. The knowledge that the process of aging is very complex can be deduced from the simple fact that there are many entirely different, yet plausible, theories of how aging works. In fact, the possibility that several of these theories are connected, or play a combined part in aging is not far fetched. Yet because the process of aging is so multifarious, just how humans complete or even begin the transition from youth to old age remains a mystery to some extent. However, with new evidence and proof supporting some of these hypotheses, opportunities for a healthier, longer life may arise.
Humans undergo several stages during their lifetime including growth, development, reproduction and senescence. Senescence is defined as the deteriorative biological changes that organisms experience as they age eventually leading to death. These changes include low metabolism, a weak immune system, memory loss, poor vision and loss of hearing. Senescence begins in humans during their post-reproductive years. However, gerontology research has shown that individuals who reproduce late have longer life spans compared to individuals who reproduce early. Nonetheless, it does not indicate that senescence is inevitable. All organisms experience senescence, but at different rates and time. Many genetic diseases such as Alzheimer’s disease and Huntington’s disease are prevalent in older individuals and the symptoms being to appear in middle adulthood. The causes of genetic diseases and disabilities in older individuals are explained by three evolutionary theories: antagonistic pleiotropy theory, mutation accumulation theory and disposable soma theory. These theories suggest that favorable natural selection and heavy allocation of resources for somatic maintenance during the reproductive period decreases the chances of genetic diseases in younger individuals.
An individual’s personality and character structure portrays a major reflection of how they age. Personality style and character structure both incorporate the conscious and unconscious motivational, cognitive and affective mental states, as well as defense mechanisms (Silver 1992). Biopsychosocial factors-broken down into biological, psychological, and sociocultural-also play a huge role in personality and aging (Notes 10/08). Some examples of biological factors are health, genetics, and physiological function. Thoughts, feelings, and emotions would be considered psychological factors. Sociocultural factors include family, religion and community. Additionally, people endure unique experiences and circumstances throughout their life course,
With healthcare in the United States advancing so rapidly, there are new ways to treat just about any kind of illness every day. With being able to treat illnesses in new ways, and also the advancement of medical equipment, comes the possibility of a lot more people living up into their 90’s, and maybe even getting to reach 100. The aging population, which keeps growing every so rapidly, will be using up a lot more sources as the years go by. This means, that we need to educate more doctors and nurses, etc., and also make more living facilities for older adults. The question that comes up in my mind, is when is “old” actually”. Most people stereotypically consider ages 75 and older old, but that doesn’t mean they are actually “old”, does it?
Desjarlais, R., & Throop, C. J. (2011). Phenomenological approaches in anthropology. Annual Review of Anthropology, 40, 87-102. doi: 10.1146/annurev-anthro-092010-153345.
In the 16th century, rumors of the Fountain of Youth had spread like wildfire. The thought of immortality, and everlasting youth had fascinated many old, and young adventurers. Most Eukaryotic organism cells are affected by a biological process known as aging. Effect of aging may include the advent of illness, disease, and ultimately death. Death, this fear of end existence had enthralled many people on the quest for prolonged longevity. Therefore, how do we extend our lifespan? Where is this “Fountain of Youth” ? Although the latter question may forever remain a lucrative theory. Perhaps the answer to prolonged longevity may reside on a little known region of a chromosomes, the telomeres.
Common sense seems to dictate that we are all going to die one day. As we all get older we crave to keep our youth, and to stay young forever is the ultimate dream. The thought of a possible immortality is just an added benefit. Even though we have strived towards this goal for centuries, have we obtained advances in successfully staying young forever? In Bill Gifford’s book “Spring Chicken: Stay Young Forever (Or Die Trying)” he explores these ideas of life and aging further. In this novel, he goes on a journey to try and debunk the mysteries and questions behind the new science of aging. He gathers information from tests and scientists from around the country to discover what really works to prevent or delay aging and what is just a hopeful hoax. He helps us figure out why we age and why aging
The elderly population is growing rapidly and now makes up greater than 13% of the United States population (U.S. census, 2010). With such a record growth, there are different aspects to aging that are still being analyzed. Many may think of reaching late life as a rite of passage, but many face this time with a different view. Through the movie "UP', we are granted an opportunity into view the struggles of an elderly widowed man by the name of Mr. Fredrickson and the challenges in which he faces in his later life. The movie, takes one on a journey through his sorrows and his triumphs until he realizes what the true meaning of happiness is.
Aging occurs at the biological, psychological and social levels. With numerous theories of aging spanning over many disciplines, no one is truly certain why we age or how we cope with it. Fortunately, our knowledge of how the body regulates or governs the rate of aging is slowly being demystifyied and we now know more about this process. Activity and disengagement are two major psychosocial theories which describe how people develop in old age.
Many do not like to talk about their age and their aging process, because to some, chronological aging has much more meaning than just the number of years that they have lived (Hooyman et al., 2015). Age really is just a number. There are centenarians and super-centenarians, like Flossie Dickey, who are still going strong at and living their daily lives with minimal restrictions (Hooyman et al., 2015), and people who struggle at the age of 80, it is all about aging successfully (Hooyman et al., 2015). What it means to age in society is a constantly changing concept, and now that the baby-boomers are starting to reach their older adult stages, maximum life spans are continuing to rise (Hooyman et al., 2015), and we see more centenarians and super-centenarians and skipped generation households (Hooyman et al.,
Aging occurs in every species. Over time a change occurs on a cellular level in a person’s body, which causes degenerative effects on the brain, muscles, organs, bones, hormones, and DNA. In 1991, the book Evolutionary Biology of Aging, offered the following definition of aging: a persistent decline in the age-specific fitness components of an organism due to internal physiological deterioration.1 Aging affects the body physically and mentally. Many people dread getting older due to the numerous changes the body goes through. The geriatric population experiences many pains and is inflicted with various diseases. There are a few who are lucky enough to not get diagnosed with a life altering disease, such as Alzheimer’s, type II diabetes, high blood pressure, macular degeneration, or some form of cancer. Studies have shown that genetics play a vital role in the aging process.
In an attempt to define ageing one must take in consideration the biophysiological together with the psychosocial aspects; these two aspects are intertwined.
During middle adulthood biological and physical changes become apparent. During this time visual perception, hearing and the reproductive system decline. Adults who have never worn glasses or contact lenses may start needing visual correction (pg 424). During this time adults may also need more light to see than their younger friends (pg 424). During middle adulthood individuals, more commonly men, develop a lower sensitivity to high pitch sounds (pg 424). This is the reason why individuals during this stage find it more difficult to hear and interpret other voices.(pg 424). The female reproductive system starts to decline, slowly ending in menopause. The decline in the circulation of estradiol, the primary hormone of estrogen, causes many differences in reproductive health. During middle age pubic hair thins, there are changes in vaginal chemistry, and the labia begins to thin and wrinkle (pg 424). The chemical changes within the vagina cause dryness and a greater likelihood of infections (pg 424). For men, the decrease in testosterone during middle age is only small however the decrease causes lower bone density and loss of muscle m...
Lifespan development is essential, as it is the changes that happen to us throughout a person’s lifespan. Our development occurs at ages stages where we develop from infancy till death. This essay will contain my life story to display the domains in 5 age stages in my lifespan development. The domains I will be exploring is in this essay is physical, emotional, cognitive, social, cultural and moral domain. The influence of biological and environmental play a significant role in my development. Development is influenced by nature or nurture and its affect will occur throughout lifespan. The changes that occur during development have stage. Each theorists has stages of development where they display the changes. This essay will explore my development that will support theorist such as Erikson, Vygotsky, Berk, Piaget and other theorist. The age stages of prenatal will display physical and emotional domain, Infancy (0-2) will portray social and emotional domain, young children (2-6) will show cognitive and social domain, middle childhood (6-12) will display socio-cultural and moral domain and adolescence will portray nature vs. nurture and cultural domain. Development is crucial for a healthy wellbeing. As a physiotherapist it is significant to understand development in age stages, as it will aid knowing how young children will react compared to an adolescence who is more development mentally, emotionally, physically, socially and culturally.
play a large part in our health and our developmental status. The role of age
In the body-transcendence versus body-preoccupation stage, one must be able to learn and accept physical changes that happen as we get older, we refer to this as transcendence. If someone is unable to do so, they become preoccupied with the physical deterioration, to the detriment of their personality development. Although the physical capabilities are not the same in the elderly as when they were young, many older people stay regularly fit considering their age. The changes that began in middle adulthood are becoming more unmistakable by the time one finds themselves in late adulthood. The two distinct types of aging are primary aging and secondary aging. Primary aging involves the irreversible changes that occur as people get older due to genetic programming. Secondary aging refers to the changes that are bought on by illnesses and diseases, not increased by age itself. Late adulthood is a very interesting period of life. Since people are now living longer than ever before, late adulthood is increasing in length. Whether we say it starts at 65 or 70 years, the amount of people included in this stage is larger than ever before, due to medicine and technological advances. One of the most obvious signs someone is in late adulthood would be a person’s hair. Most people’s hair become distinctly gray and eventually white, which may thin