sex·a·ge·nar·i·an I. \ˌseksəjəˈna(a)rēən, -ˈner-, -ˈnār-\noun (-s) Etymology: Latin sexagenarius containing or consisting of sixty + English -an, n. suffix : a person 60 or more and less than 70 years old II. \| ̷ ̷ ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷ ̷ ̷\adjective 1.: 60 or more and less than 70 years old 2.: of or relating to sexagenarian