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Age, the amount of time someone has been alive or something 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)
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. [1] Old age is not a definite biological stage: the chronological age denoted as "old age" varies culturally and historically. [2]
This is an accepted version of this page This is the latest accepted revision, reviewed on 13 February 2025. Biological process of getting older This article is about ageing specifically in humans. For the ageing of whole organisms including animals, see Senescence. For other uses, see Ageing (disambiguation). Part of a series on Human growth and development Stages Gamete Zygote Embryo Fetus ...
The concept of adulthood has legal and socio-cultural definitions. The legal definition [4] of an adult is a person who is fully grown or developed. This is referred to as the age of majority, which is age 18 in most cultures, although there is a variation from 15 to 21. The typical perception of adulthood is that it starts at age 20 or 21.
Population ageing is a shift in the distribution of a country's population towards older ages and is usually reflected in an increase in the population's mean and median ages, a decline in the proportion of the population composed of children, and a rise in the proportion of the population composed of the elderly.
Most legal systems define a specific age for when an individual is allowed or obliged to do particular activities. These age specifications include voting age, drinking age, age of consent, age of majority, age of criminal responsibility, marriageable age, age of candidacy, and mandatory retirement age.
Middle age (or middle adulthood) is the age range of the years halfway between childhood and old age. [1] The exact range is subject to public debate , but the term is commonly used to denote the age range from around 45 to around 65 years.
In sociology and anthropology, an age grade or age class is a form of social organization based on age, within a series of such categories, through which individuals pass over the course of their lives. This is in contrast to an age set, to which individuals remain permanently attached as the set itself becomes progressively more senior.