sexgenario is incorrectly written, and should be written as "sixty" being its meaning: See: Sexagenario.
sexgenario is incorrectly written, and should be written as "Sexagenario" being its meaning: Sexgenario is misspelled. The right thing is Sexagenario. You want to say 60-year-old. It has 60 years. Pre-sixties, sesentañero.