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Noun: septuagenarian  ,sep-tyoo-u-ju'neh-ree-un
  1. Someone whose age is in the seventies
    "The septuagenarian celebrated her 75th birthday with a skydiving adventure"

Derived forms: septuagenarians

Type of: golden ager [N. Amer, informal], old person, oldster [N. Amer, informal], senior citizen

Encyclopedia: Septuagenarian