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Adjective: sexagenarian  ,sek-su-ju'neh-ree-un
  1. Being from 60 to 69 years old
    "the sexagenarian population is growing"
Noun: sexagenarian  ,sek-su-ju'neh-ree-un
  1. Someone whose age is in the sixties

Derived forms: sexagenarians

See also: old

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

Encyclopedia: Sexagenarian