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Age, the amount of time someone or something has been alive or has existed. East Asian age reckoning, an Asian system of marking age starting at 1. Ageing or aging, the process of becoming older. Senescence, the gradual deterioration of biological function with age. Human development (biology)
Lists. Society portal. v. t. e. Gerontology ( / ˌdʒɛrənˈtɒlədʒi / JERR-ən-TOL-ə-jee) is the study of the social, cultural, psychological, cognitive, and biological aspects of aging. The word was coined by Ilya Ilyich Mechnikov in 1903, from the Greek γέρων ( gérōn ), meaning "old man", and -λογία ( -logía ), meaning ...
Adolescence (from Latin adolescere 'to mature') is a transitional stage of physical and psychological development that generally occurs during the period from puberty to adulthood (typically corresponding to the age of majority).
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 ...
Ageing (or aging in American English) is the process of becoming older.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.
1) The curtate future lifetime , denoted K (x) {\displaystyle K(x)} , is a discrete random variable representing the remaining lifetime at age x {\displaystyle x} , rounded down to whole years. Life expectancy, more technically called the curtate expected lifetime and denoted e x {\displaystyle \,e_{x}\!} , [a] is the mean of K (x) {\displaystyle K(x)} —that is to say, the expected number of ...
Coming of age is a young person 's transition from being a child to being an adult. The specific age at which this transition takes place varies between societies, as does the nature of the change. It can be a simple legal convention or can be part of a ritual or spiritual event. In the past, and in some societies today, such a change is often ...
Aging has a significant impact on society. People of different ages and gender tend to differ in many aspects, such as legal and social responsibilities, outlooks on life, and self-perceptions. Young people tend to have fewer legal privileges (if they are below the age of majority ), they are more likely to push for political and social change ...