RhymeZone: sexagenary definitions

Definitions of sexagenary:

adjective: Containing sixty years.
adjective: (now rare) Synonym of sexagenarian: lasting or aged sixty years; sixty-year-old.
adjective: (mathematics, astronomy, now rare) Synonym of sexagesimal: base-60.
noun: (mathematics, astronomy, now rare) Synonym of sexagesimal: base-60 numeration.
noun: (now rare) Synonym of sexagenarian: a sixty-year-old.

(Definitions from Wiktionary)