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Middle Age
Middle age (or middle adulthood) is the age range of the years halfway between childhood and old age. The exact range is subject to public debate, but the term is commonly used to denote the age range from 45 to 65 years. Overall This time span is generally referred to as "middle age" and can be defined as the time of ages about 40–45 to about 60–65. Many changes may occur between young adulthood and this stage. There is no universal consensus on what the exact definition of middle age is, but usual characteristics include the beginning of rapid decline of fertility, graying of hair, and other physical changes. Those in middle age continue to develop relationships and adapt to changes in relationships. Such changes are highly evident in the maturing relationships between growing or grown children and aging parents. Community involvement is fairly typical of this stage of adulthood, as is continued career development. Physical characteristics Middle-aged adults may begin t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Childhood
A child () is a human being between the stages of childbirth, birth and puberty, or between the Development of the human body, developmental period of infancy and puberty. The term may also refer to an unborn human being. In English-speaking countries, the legal definition of ''child'' generally refers to a minor (law), minor, in this case as a person younger than the local age of majority (there are exceptions such as, for example, the consume and purchase of alcoholic beverage even after said age of majority), regardless of their physical, mental and sexual development as biological adults. Children generally have fewer Children's rights, rights and responsibilities than adults. They are generally classed as unable to make serious decisions. ''Child'' may also describe a relationship with a parent (such as sons and daughters of any age) or, Metaphor, metaphorically, an authority figure, or signify group membership in a clan, tribe, or religion; it can also signify being str ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DNA Damage (naturally Occurring)
Natural DNA damage is an alteration in the chemical structure of DNA, such as a break in a strand of DNA, a nucleobase missing from the backbone of DNA, or a chemically changed base such as 8-OHdG. DNA damage can occur naturally or via environmental factors, but is distinctly different from mutation, although both are types of error in DNA. DNA damage is an abnormal chemical structure in DNA, while a mutation is a change in the sequence of base pairs. DNA damages cause changes in the structure of the genetic material and prevents the replication mechanism from functioning and performing properly. The DNA damage response (DDR) is a complex signal transduction pathway which recognizes when DNA is damaged and initiates the cellular response to the damage. DNA damage and mutation have different biological consequences. While most DNA damages can undergo DNA repair, such repair is not 100% efficient. Un-repaired DNA damages accumulate in non-replicating cells, such as cells in the brai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Middle Age
Middle age (or middle adulthood) is the age range of the years halfway between childhood and old age. The exact range is subject to public debate, but the term is commonly used to denote the age range from 45 to 65 years. Overall This time span is generally referred to as "middle age" and can be defined as the time of ages about 40–45 to about 60–65. Many changes may occur between young adulthood and this stage. There is no universal consensus on what the exact definition of middle age is, but usual characteristics include the beginning of rapid decline of fertility, graying of hair, and other physical changes. Those in middle age continue to develop relationships and adapt to changes in relationships. Such changes are highly evident in the maturing relationships between growing or grown children and aging parents. Community involvement is fairly typical of this stage of adulthood, as is continued career development. Physical characteristics Middle-aged adults may begin t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Old Age
Old age is the range of ages for people nearing and surpassing life expectancy. People who are of old age are also referred to as: old people, elderly, elders, senior citizens, seniors or older adults. Old age is not a definite biological stage: the chronological age denoted as "old age" varies culturally and historically. Some disciplines and domains focus on the aging and the aged, such as the organic processes of aging (senescence), medical studies of the aging process (gerontology), diseases that afflict older adults (geriatrics), technology to support the aging society (gerontechnology), and leisure and sport activities adapted to older people (such as senior sport). Older people often have limited regenerative abilities and are more susceptible to illness and injury than younger adults. They face social problems related to retirement, loneliness, and ageism. In 2011, the United Nations proposed a human-rights convention to protect old people. History European The hist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stages Of Human Development
Development of the human body is the process of growth to maturity. The process begins with fertilization, where an egg released from the ovary of a female is penetrated by a sperm cell from a male. The resulting zygote develops through mitosis and cell differentiation, and the resulting embryo then implants in the uterus, where the embryo continues development through a fetal stage until birth. Further growth and development continues after birth, and includes both physical and psychological development that is influenced by genetic, hormonal, environmental and other factors. This continues throughout life: through childhood and adolescence into adulthood. Before birth Development before birth, or prenatal development () is the process in which a zygote, and later an embryo, and then a fetus develops during gestation. Prenatal development starts with fertilization and the formation of the zygote, the first stage in embryonic development which continues in fetal develop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Youth
Youth is the time of life when one is young. The word, youth, can also mean the time between childhood and adulthood (Maturity (psychological), maturity), but it can also refer to one's peak, in terms of health or the period of life known as being a young adult. Youth is also defined as "the appearance, freshness, vigor, spirit, etc., characteristic of one, who is young". Its definitions of a specific age range varies, as youth is not defined Chronology, chronologically as a stage that can be tied to specific age ranges; nor can its end point be linked to specific activities, such as taking unpaid work, or having Human sexual activity, sexual relations. Youth is an experience that may shape an individual's level of Dependency theory, dependency, which can be marked in various ways according to different Culture, cultural perspectives. Personal experience is marked by an individual's cultural norms or traditions, while a youth's level of dependency means the extent to which they ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Young Adult
In medicine and the social sciences, a young adult is generally a person in the years following adolescence, sometimes with some overlap. Definitions and opinions on what qualifies as a young adult vary, with works such as Erik Erikson's stages of human development significantly influencing the definition of the term; generally, the term is often used to refer to adults in approximately the age range of 18 to 45 years. Some inclusive definitions extend the range into the early to mid 40s, while others end earlier. The United States Census Bureau, for instance, defines young adults as those between the ages of 18 and 32. (As of 2024): Over 65 million Americans born approximately from 1990 to 2006, would likely fall under this category. The young adult stage in human development precedes middle adulthood.Martin BrinerErik Erikson page, 1999, on Briner', Department of Mathematical Sciences, Center for Assessment and Program Evaluation, US Military Academy at West Point. Accessed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Midlife Crisis
A midlife crisis is a transition of identity and self-confidence that can occur in middle-aged individuals, typically 45 to 65 years old. The phenomenon is described as a psychological crisis brought about by events that highlight a person's growing age, inevitable mortality, and possible lack of accomplishments in life. This may produce feelings of intense depression, remorse, and high levels of anxiety; or the desire to achieve youthfulness, make drastic changes to their current lifestyle, or change past decisions and events. Crisis versus stressors Personality and a history of psychological crisis are believed to predispose some people to this "traditional" midlife crisis. People going through midlife crisis have a variety of symptoms and exhibit a disparate range of behaviors. Mid-life is the time from years 40-60 where a person is often evaluating their own life. However, many mid-life stressors are often labeled as a mid-life crisis. Day-to-day stressors are likely to add u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aging
Ageing (or aging in American English) is the process of becoming Old age, older until death. The term refers mainly to humans, many other animals, and fungi; whereas for example, bacteria, perennial plants and some simple animals are potentially biologically immortal. In a broader sense, ageing can refer to single cells within an organism which have Cellular senescence, ceased dividing, or to the Population ageing, population of a species. In humans, ageing represents the accumulation of changes in a human being over time and can encompass physical, psychological, and social changes. Reaction time, for example, may slow with age, while memories and general knowledge typically increase. Of the roughly 150,000 people who die each day across the globe, about two-thirds die from age-related causes. Current Theory of aging, ageing theories are assigned to the damage concept, whereby the accumulation of damage (such as DNA oxidation) may cause biological systems to fail, or to the p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
