Medical Definition of Age by decade

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Age by decade: A term designating someone's age by decade. For example, a septuagenarian refers to someone in his or her seventies (age 70 to 79). The prefix in such terms is always from the Latin. For example, the Latin septuageni = seventy.

  • Denarian: Someone age 10 to 19.
  • Vicenarian: Someone in his or her twenties.
  • Tricenarian: Someone in his or her thirties.
  • Quadragenarian: Someone in his or her forties.
  • Quinquagenarian: Someone in his or her fifties.
  • Sexagenarian: Someone in his or her sixties.
  • Septuagenarian: Someone in his or her seventies.
  • Octogenarian: Someone in his or her eighties.
  • Nonagenarian: Someone in his or her nineties.
  • Centenarian: Someone 100 or more.
  • Supercentenarian: Someone 110 years old or more (no upper limit).

The terms denarian, vicenarian, tricenarian, and quadragenarian are not in common usage. The term supercentenarian was coined in 1991.

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Reviewed on 12/11/2018

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