sexagenarian

adjective

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

noun

2. a sexagenarian person.

noun

1. a person from 60 to 69 years old

adjective

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

n.1738, “person sixty years old,” from Latin sexagenarius “containing sixty,” from sexagenarius, from sexageni “sixty each, sixty at a time,” from sexaginta “sixty,” from comb. form of sex (see six) + -genaria “ten times,” from -ginta “tens,” from PIE *dkm-ta-, from *dekm- “ten” (see ten). As an adjective from 1836.