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It is common in demography to split the population into three broad age groups: children and young adolescents (under 15 years old) the working-age population (15-64 years) and. the elderly population (65 years and older)

We consider the function of age categorization, both as a way of classifying others to simplify the world around us and classifying ourselves to help define our own identity.

Adolescence (generally defined as puberty through age 18) Young adulthood (generally defined as 18 to 22 or 18 to 25) Later adulthood (generally defined as mid-20s and older)

1 Millennials are defined as persons born between 1981 and 1997. In some parts of the report, special focus is given to younger millennials, ages 18-24, and older millennials, ages 25-34, as these groups represent different stages of the young adult cycle.

Age Neonates or newborns (birth to 1 month) Infants (1 month to 1 year) Children (1 year through 12 years) Adolescents (13 years through 17 years. They may also be referred to as teenagers depending on the context.) Adults (18 years or older) Older adults (65 and older)*

Why ask for survey respondents' age? Given the differences in life experience between different age groups, as well as people's changing tastes and behaviour as they get older, it can be very useful to include a survey age question.

1. By Generation The Silent Generation: Born 1928-1945. Baby Boomers: Born 1946-1964. Generation X: Born 1965-1980. Millennials: Born 1981-1996. Generation Z: Born 1997-2012.

The three-age system is the periodization of human pre-history (with some overlap into the historical periods in a few regions) into three time-periods: the Stone Age, the Bronze Age, and the Iron Age; although the concept may also refer to other tripartite divisions of historic time-periods.

Age group age_groupNewborn newborn Up to 3 months old. Newborn sizes are often identified by the age range in months (03) or just newborn.Infant infant 312 months old.Toddler toddler 15 years old.Kids kids 513 years old.Adult adult Typically teens or older.

As humans, we have two different ageschronological and biological. Chronological age is the number of years a person has been alive, while biological age refers to how old a person seems.