sex·a·ge·nar·i·an /ˌsɛksəʤəˈnɛriən/
(a.)六十歲的
Sex·a·ge·na·ri·an n. A person who is sixty years old.
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sexagenarian
adj : being from 60 to 69 years old; "the sexagenarian population
is growing"
n : someone whose age is in the sixties