sexagenary


sex·ag·e·nar·y

S0299900 (sĕk-săj′ə-nĕr′ē)adj.1. Relating to or proceeding by sixties.2. Sexagenarian.n. pl. sex·ag·e·nar·ies A sexagenarian.
[Latin sexāgēnārius, from sexāgēnī, sixty each, from sexāgintā, sixty : sex, six; see sex- + -gintā, ten times; see dekm̥ in Indo-European roots.]