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An animal's life is often divided into various age ranges. However, because biological changes are slow-moving and can vary within one's own species, arbitrary dates are usually set to mark periods of life. The human divisions given below are not valid in all cultures: Juvenile (via infancy, childhood, preadolescence, adolescence): 0–19 Early adulthood: 20–39 Middle adulthood: 40–59 Late adulthood: 60+ People from 13 to 19 years of age are also known as teens or teenagers. Tween or Twelvie is an American neologism referring to someone aged 10 through 12.[26] The casual terms "twentysomething", "thirtysomething", etc. are also in use to describe people by decades of age, along with the systematic terms such as "vicenarian", "tricenarian", "quadragenarian", etc. |
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