Denarian - Dividing The Lifespan

Dividing The Lifespan

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 : 0–19
  • Early adulthood: 20–39
  • Middle adulthood: 40–59
  • Late adulthood: 60+

Ages can also be divided into numerical units:

Term Age (years, inclusive)
Denarian 10 to 19
Vicenarian 20 to 29
Tricenarian 30 to 39
Quadragenarian 40 to 49
Quinquagenarian 50 to 59
Sexagenarian 60 to 69
Septuagenarian 70 to 79
Octogenarian 80 to 89
Nonagenarian 90 to 99
Centenarian 100 to 109
Supercentenarian 110 and older


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 between the ages of 8 and 12. The casual terms "twentysomething", "thirtysomething", etc. are also in use to describe people by decades of age.

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