sexagenarian

From Latin sexāgēnārius (“containing 60”) + -an (“forming adjectives and representative nouns”), either directly or via French sexagénaire, from Latin sexāgēnus (“60 each”) + -ārius (“-ary”), from sexāgintā (“six tens, 60”).

• (General American) IPA^(key): /ˌsɛksəd͡ʒɪˈnɛɹiən/
• (Received Pronunciation) IPA^(key): /ˌsɛksəd͡ʒɪˈnɛəɹɪən/

sexagenarian (plural sexagenarians)

1. Synonym of sixtysomething: a person between 60 and 69 years old.
   • 2010 December 7, J.A., “Travel in style”, in The Economist‎:

     Luxury hotels and travel planners must be licking their lips at the prospect that a significant portion of those new sexagenarians will want the trip of a lifetime (and hang the kids' inheritance…).

sexagenarian (not comparable)

1. Of or related to sixtysomethings.

   Coordinate terms: vicenarian, tricenarian, quadragenarian, quinquagenarian, semicentenarian, septuagenarian, nonagenarian, centenarian, supercentenarian

• sexagenary, hexagenarian

• sexagenarianism

• sexagesimal

• “sexagenarian, n. and adj.”, in OED Online ⁠, Oxford, Oxfordshire: Oxford University Press, 2022.