sex·a·ge·nar·i·an 
(sĕk′sə-jə-nârē-ən)
(sĕk′sə-jə-nârē-ən)n.
A person who is 60 years old or between the ages of 60 and 70.
adj.
1. Being 60 years old or between the ages of 60 and 70.
2. Of or relating to a sexagenarian.
[From Latin sexāgēnārius, sexagenary; see SEXAGENARY.]