sexagenarian

UK: /ˌsɛksədʒɪˈnɛərɪən/ US: (sek′sə jə nâr′ē ən)

WordReference Random House Unabridged Dictionary of American English © 2025

sex•a•ge•nar•i•an  (sek′sə jə nâr′ē ən), adj. 

1. of the age of 60 years or between 60 and 70 years old.

n. 

2. a sexagenarian person.

• Latin sexāgēnāri(us) sexagenary + -an
• 1730–40

Collins Concise English Dictionary © HarperCollins Publishers::

sexagenarian / ˌsɛksədʒɪˈnɛərɪən/ noun

1. a person from 60 to 69 years old

adjective

1. being from 60 to 69 years old
2. of or relating to a sexagenarian

Etymology: 18th Century: from Latin sexāgēnārius, from sexāgēnī sixty each, from sexāgintā sixty